Παραπομπή APA

George J & Stakma E C, H. (1957). Principles of plant pathology. Ronald press co.

Παραπομπή Chicago Style

George J και Harrar Stakma E C. Principles of Plant Pathology. Newyork: Ronald press co, 1957.

Παραπομπή MLA

George J και Harrar Stakma E C. Principles of Plant Pathology. Ronald press co, 1957.