Παραπομπή APA

Milligan, J. E. (1974). Celestial navigation by H.O.249. Maritime press.

Παραπομπή Chicago Style

Milligan, John E. Celestial Navigation by H.O.249. Cambridge: Maritime press, 1974.

Παραπομπή MLA

Milligan, John E. Celestial Navigation by H.O.249. Maritime press, 1974.