Hyman L.H. The Invertebrates, Vol. II. Platyhelminthes and Rhynchocoela. The acoelomate Bilateria

McGraw-Hill Book Company, 1951. — 550 p. This is Volume II of a 6-volume monograph treatise on the invertebrate metazoans. Volume II deals with the acoelomates: Platyhelminthes, Rhynchocoela, etc. A thorough academic classic in invertebrate zoology.