Παραπομπή σε μορφή APA (7η εκδ.)

Oil Companies International Marine Forum & Society of International Gas Tanker & Terminal Operators. (1990). Ship information questionnaire for gas carriers. Witherby & Co, Ltd..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Oil Companies International Marine Forum και Society of International Gas Tanker & Terminal Operators. Ship Information Questionnaire for Gas Carriers. London: Witherby & Co, Ltd., 1990.

Παραπομπή σε μορφή MLA (9th εκδ.)

Oil Companies International Marine Forum και Society of International Gas Tanker & Terminal Operators. Ship Information Questionnaire for Gas Carriers. Witherby & Co, Ltd., 1990.