Adler, B. (1967). Letters to the Air Force on UFOs (1a. ed.). Dell Book.
Chicago-čujuhus (17. p.)Adler, Bill. Letters to the Air Force on UFOs. 1a. ed. Nueva York: Dell Book, 1967.
MLA-čujuhus (9. p.)Adler, Bill. Letters to the Air Force on UFOs. 1a. ed. Dell Book, 1967.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.