Gudas, Raymond. Gerbils : : everything about purchase, care, nutrition, diseases, breeding, and behavior / [electronic resource] / Raymond Gudas ; with 20 color photographs by Aaron Norman and 30 drawings by Michele Earle Bridges ; consulting editor, Matthew M. Vriends.. — Woodbury, N.Y. : : Barron's,, c1986.. — 63 p. : : ill. (some col.) ; 20 cm.