APA استشهاد

Waddington, C. H. (1966). Principles of development and differentiation.

استشهاد بنمط شيكاغو

Waddington, C H. Principles of Development and Differentiation. Macmillan Company, New York, 1966.

MLA استشهاد

Waddington, C H. Principles of Development and Differentiation. 1966.