Cita APA (7th ed.)

Walls, J. G. (1975). Cowries (Second edition.). T.F.H. Publications.

Cita Chicago (17th ed.)

Walls, Jerry G. Cowries. Second edition. Neptune, New Jersey: T.F.H. Publications, 1975.

Cita MLA (9th ed.)

Walls, Jerry G. Cowries. Second edition. T.F.H. Publications, 1975.