Watterson, R. L. (1965). Laboratory studies of chick and pig embryos. Burgess Publishing.
Cita Chicago (17th ed.)Watterson, Ray L. Laboratory Studies of Chick and Pig Embryos. Minneapolis, Minn: Burgess Publishing, 1965.
Cita MLA (9th ed.)Watterson, Ray L. Laboratory Studies of Chick and Pig Embryos. Burgess Publishing, 1965.
Atenció: Aquestes cites poden no estar 100% correctes.