Não informado. (2004). Seatrade web. Seatrade Information Services.
Chicago (17e ed.) BronvermeldingNão informado. Seatrade Web. Hong Kong, China: Seatrade Information Services, 2004.
MLA (8e ed.) BronvermeldingNão informado. Seatrade Web. Seatrade Information Services, 2004.
Let op: Deze citaties zijn niet altijd 100% accuraat.