Gaya APA

H., J. (1999). Celestial navigation for deck officers and for yachtmasters ocean A south african maritime safety authority. Part 1 - Navigation (Ed. 3). : Yachtmaster Ocean Services.

Gaya MLA

H., Jaaback. "Celestial navigation for deck officers and for yachtmasters ocean A south african maritime safety authority. Part 1 - Navigation". Ed. 3 : Yachtmaster Ocean Services, 1999. Electronic Resource.