APA (7 वां संस्करण) प्रशस्ति पत्र
Cotreau, J. D. (1975). Historical development of the Universal Postal Union and the question of membership.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Cotreau, James Donald. Historical Development of the Universal Postal Union and the Question of Membership. Fribourg, Switzerland, 1975.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Cotreau, James Donald. Historical Development of the Universal Postal Union and the Question of Membership. 1975.
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