Παραπομπή σε μορφή APA (7η εκδ.)

Couper, A. D. (1967). The island trade: An analysis of the environment and operation of seaborne trade among three island groups in the Pacific.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Couper, Alastair Dougal. The Island Trade: An Analysis of the Environment and Operation of Seaborne Trade Among Three Island Groups in the Pacific. 1967.

Παραπομπή σε μορφή MLA (8th εκδ.)

Couper, Alastair Dougal. The Island Trade: An Analysis of the Environment and Operation of Seaborne Trade Among Three Island Groups in the Pacific. 1967.