Gaya APA
Williamson, P, R. (2001).
Ship Manoeuvring Principles and Pilotage (Ed. 1).
United Kingdom:
Penerbit Witherby Seamanship International.
Gaya MLA
Williamson, Paul, R..
"Ship Manoeuvring Principles and Pilotage".
Ed. 1
United Kingdom:
Penerbit Witherby Seamanship International,
2001.
Text.