Cita APA

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

Citación estilo Chicago

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

Cita MLA

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