| Country/Region | Release Date/Issue Date(Detailed) |
| 18 April 1968 | |
| 11 April 1968 | |
| 2 April 1968 ......(Washington, D.C.) (premiere) | |
| 3 April 1968 ......(New York City, New York) (premiere) | |
| 4 April 1968 ......(Los Angeles, California) (premiere) | |
| 6 April 1968 |