Παραπομπή APA

Roberts, H. F. (1929). Plant hybridization before mendal. Hafner Publishing Compnay.

Παραπομπή Chicago Style

Roberts, H F. Plant Hybridization Before Mendal. Newyork: Hafner Publishing Compnay, 1929.

Παραπομπή MLA

Roberts, H F. Plant Hybridization Before Mendal. Hafner Publishing Compnay, 1929.