By Diem, Liselott..
Valladolid Editorial Miñon 1978 .
ca 150 p. , Translation of: Schwimmen im 1.-4. Lebensjahr.

By López, Mario A..
Buenos Aires Editorial Paidós 1972 .
147 p.

By Conde Pérez, Enrique..
Madrid Gymnos Editorial 1997 .
203 p. , Includes bibliographical references (p.191-203). 21 cm..
8480131136

By Vázquez Menlle, Juan..
Madrid GYMNOS EDITORIAL 1999 .
298 p. 24 cm..
8480132310