Παραπομπή APA

Picard, M. D. (1975). Grit and clay. Elsevier scientific publishing.

Παραπομπή Chicago Style

Picard, M. D. Grit and Clay. New york: Elsevier scientific publishing, 1975.

Παραπομπή MLA

Picard, M. D. Grit and Clay. Elsevier scientific publishing, 1975.