APA-Zitierstil (7. Ausg.)

Willey, R. C. (1990). A guide to the history and collecting of coins. Unitrade Press.

Chicago-Zitierstil (17. Ausg.)

Willey, Robert C. A Guide to the History and Collecting of Coins. Toronto, Canada: Unitrade Press, 1990.

MLA-Zitierstil (9. Ausg.)

Willey, Robert C. A Guide to the History and Collecting of Coins. Unitrade Press, 1990.