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| Label: | WEA WEA 79.301 |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | Vinyl (7" , Single , 45 RPM) |
| A1 | Hard To Say I'm Sorry » Written-By: David Foster, Peter Cetera | 3:40 |
| A2 | Get Away » Written-By: David Foster, Peter Cetera, Robert Lamm | 1:29 |
| B | Sonny Think Twice » Written-By: Bill Champlin, Danny Seraphine | 4:00 |
| Label: | Full Moon K 79301 |
| Genre: | Rock, Pop |
| Style: | Pop Rock, Classic Rock |
| Format: | Vinyl (7" , 45 RPM) |
| A | Hard To Say I'm Sorry » Written-By: D. Foster, P. Cetera | |
| B | Sonny Think Twice » Written-By: B. Champlin, D. Seraphine |
| Label: | Full Moon FM 79 301-N |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | Vinyl (7" , Single , 45 RPM) |
| A | Hard To Say I'm Sorry » Written-By: David Foster, Peter Cetera | 3:43 |
| B | Sonny Think Twice » Written-By: Bill Champlin, Danny Seraphine | 4:00 |
| Label: | Full Moon FM 79 337 |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | Vinyl (12" , Maxi-Single , 45 RPM , Limited Edition) |
| A | Hard To Say I'm Sorry / Get Away | 5:06 |
| B | Love Me Tomorrow | 5:06 |
| Label: | Full Moon U 79301 |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | Vinyl (7") |
| A | Hard To Say I'm Sorry » Written-By: D. Foster, P. Cetera | 3:43 |
| B | Sonny Think Twice » Written-By: B. Chaplin, D. Seraphine | 4:00 |
| Label: | Full Moon 79301 |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | Vinyl (7" , 45 RPM , Single) |
| A | Hard To Say I'm Sorry » Written-By: David Foster, Peter Cetera | 3:42 |
| B | Sonny Think Twice » Written-By: Bill Champlin, Danny Seraphine | 4:00 |
| Label: | Full Moon 7-29979 |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | Vinyl (7" , 45 RPM) |
| A | Hard To Say I'm Sorry » Written-By: David Foster, Peter Cetera | 3:42 |
| B | Sonny Think Twice » Written-By: Bill Champlin, Danny Seraphine | 4:00 |
| Label: | Warner-Pioneer Corporation P-1680 |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | Vinyl (7" , 45 RPM) |
| A | Hard To Say I'm Sorry » Written-By: David Foster, Peter Cetera | 3:51 |
| B | Sonny Think Twice » Written-By: Bill Champlin, Danny Seraphine | 4:00 |
| Label: | Full Moon GFMS 0438 |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | Vinyl (7" , 45 RPM) |
| A | Hard To Say I'm Sorry | 3:42 |
| B | Love Me Tomorrow | 3:55 |
| Label: | Full Moon GFMS 0738 |
| Genre: | Rock |
| Style: | Pop Rock, Classic Rock |
| Format: | Vinyl (7" , Single) |
| A | Hard To Say I'm Sorry | 3:42 |
| B | Love Me Tomorrow |
| Label: | WEA 18.054 |
| Genre: | Pop, Rock |
| Style: | Pop Rock, Ballad |
| Format: | Vinyl (7" , 33 ⅓ RPM , Single) |
| A | Hard To Say I'm Sorry | 5:06 |
| B | Sonny Think Twice | |
| Label: | Full Moon 92 99797 |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | Vinyl (7" , 45 RPM) |
| A | Hard To Say I'm Sorry » Written-By: David Foster, Peter Cetera | 3:42 |
| B | Sonny Think Twice » Written-By: Bill Champlin, Danny Seraphine | 4:00 |
| Label: | Full Moon 79301 |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | Vinyl (7" , Single , 45 RPM) |
| A1 | Hard To Say I'm Sorry (Es Dificil Decir Lo Siento) » Written-By: David Foster, Peter Cetera | 3:40 |
| A2 | Get Away (Largate) » Written-By: David Foster, Peter Cetera, Robert Lamm | 1:29 |
| B | Sonny Think Twice » Written-By: Bill Champlin, Danny Seraphine | 4:00 |
| Label: | WEA WPDR-3081 |
| Genre: | Rock |
| Style: | Pop Rock |
| Format: | CD (Mini , Single) |
| 1 | Hard To Say I'm Sorry | 3:42 |
| 2 | Sonny Think Twice | 3:56 |