Παραπομπή σε μορφή APA (7η εκδ.)

Nypan, A. (1960). Market trade: A sample survey of market traders in Accra. Economic Research Division, University College of Ghana.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Nypan, Astrid. Market Trade: A Sample Survey of Market Traders in Accra. [Legon, Ghana?]: Economic Research Division, University College of Ghana, 1960.

Παραπομπή σε μορφή MLA (8th εκδ.)

Nypan, Astrid. Market Trade: A Sample Survey of Market Traders in Accra. Economic Research Division, University College of Ghana, 1960.