Παραπομπή APA

Roberts, L. W. (1974). Encyclopedia of minerals. Van Nostrand reinhold company.

Παραπομπή Chicago Style

Roberts, Lincoln Willard. Encyclopedia of Minerals. New York: Van Nostrand reinhold company, 1974.

Παραπομπή MLA

Roberts, Lincoln Willard. Encyclopedia of Minerals. Van Nostrand reinhold company, 1974.