Waddington, C. H. (1956). Principles of Embryology. George Allen & Unwin.
Cita Chicago (17th ed.)Waddington, Conrad Hal. Principles of Embryology. London, United Kingdom: George Allen & Unwin, 1956.
Cita MLA (9th ed.)Waddington, Conrad Hal. Principles of Embryology. George Allen & Unwin, 1956.
Atenció: Aquestes cites poden no estar 100% correctes.