The IUCN invertebrate red data book.

Manylion Llyfryddiaeth
Awduron Eraill:	Wells, Susan M., Robert M. Pyle and N.Mark Collins, Compilers
Fformat:	Llyfr
Cyhoeddwyd:	Gland, Switzerland International Union for Conservation of Nature and Natural Resources c1983
Pynciau:	Invertebrates.