APA

Robbins P., Lee D., . (1979). Guide to Precious Metals and their Markets. New York: Nichols Publishing Co.

Chicago

Robbins Peter, Lee Douglass, . 1979. Guide to Precious Metals and their Markets. New York: Nichols Publishing Co.

Harvard

Robbins P., Lee D., . (1979). Guide to Precious Metals and their Markets. New York: Nichols Publishing Co.

MLA

Robbins Peter, Lee Douglass, . Guide to Precious Metals and their Markets. New York: Nichols Publishing Co. 1979.