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- Language: English
- Year: 2004
- Author: Cornelis C. Berg
- Language: English
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- Author: Richard W. Spjut
- Language: English
- Year: 1994
- Author: C.C. Berg R. W. A. P. Akkermans E. C. H. van Heusden
- Language: English
- Year: 1990
- Author: Sandra Knapp
- Language: English
- Year: 2002
- Author: Cornelis C. Berg
- Language: English
- Year: 2001
- Author: Richard W. Spjut
- Language: English
- Year: 1994
- Author: C.C. Berg R. W. A. P. Akkermans E. C. H. van Heusden
- Language: English
- Year: 1990