By Oakley, Gilbert..
Madrid EDAF 1990 .
141 p. , Translation of: The power of positive thought. 21 cm..
8476404115

By Alberoni, Francesco..
Barcelona Gedisa 1995 .
165[1] p. , Translation of: L'ottimismo,c 1994. 23 cm..
8474325854(hardcover)

By Seligman, Martin E. P..
Barcelona Grijalbo 1999 .
373 p. , Includes index. | Translation of: The optimistic child. 19 cm..
8425332605

By Clavell, Samuel..
Bogotá Editorial Norma 2004 .
226 p. 23 cm..
9580479364

By Seligman, Martin E. P..
New York Vintage Books 2006 .
x, 319 p. , Originally published: Pocket Books, 1998. 21 cm..
1400078393 (pbk.)

By Jaramillo, Jaime,.
[Colombia] Liderazgo Papá Jaime 2006 .
202 [1]p. , Translation of: Volver a lo básico ,c 2005. 21 cm..
9589664342

By Greive, Bradley Trevor..
Kansas City, Mo. Andrews McMeel Pub. 2003 .
110 p. 16 cm..
0740738402

By Nogueras, José.
Caguas, Puerto Rico : Jose Nogueras Publishing, 2018 .
1059, páginas : 21 cm..
9780692129586

By Lecomte, Jacques.
Barcelona : Plataforma Editorial, 2018 .
232 páginas: ilustraciones (blanco y negro) ; 22 cm 9788417376741

By Pérez Rosario, Cristina.
Ponce, Puerto Rico : El Autor, 2015 .
69 páginas :