- Author: Barbara Lee Bleau
- Language: English
- Year: 1994
- Author: Kathleen Levitz
- Language: English
- Year: 1979
- Author: Vicenc Ballestar, Macks Jon
- Language: English, Spanish
- Year: 1995
- Author: Gabriele Fahr-Becker Gabriele Sterner
- Language: English
- Year: 1982
- Author: Vincenc Ballestar
- Language: English
- Year: 1996
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- Language: English
- Author: Gary Sattelmeyer
- Language: English
- Year: 1999
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- Language: English
- Year: 1994
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- Language: English
- Year: 1998
- Author: Arthur H. Bell Gary G. Williams
- Language: English
- Year: 1999