- Author: Ralph Carter Elwood
- Language: English
- Year: 1974
- Author: T.A.M. Fontaine
- Language: English
- Year: 1990
- Author: Peter of Spain L.M.de Rijk
- Language: Latin
- Year: 1973
- Author: Leo J. Elders
- Language: English
- Year: 1961
- Author: Leo Elders
- Language: English
- Year: 1972
- Author: Frieder Naschold Robert E. Cole Bjorn Gustavsen Hans van Beinum
- Language: English
- Year: 1993
- Author: Jaap Mansfeld
- Language: English
- Year: 1971