- Author: Marvin J. Greenberg John R. Harper
- Language: English
- Year: 1981
- Author: Michael Begon Colin R. Townsend John L. Harper
- Language: English
- Year: 2006
- Author: Marie Annette Harper
- Language: English
- Year: 2003
- Author: Harper J.C. Delhanty J.D.A. Handyside A.H.
- Language: English
- Year: 2001
- Author: John Barrow Simon Conway Morris Stephen Freeland Charles Harper
- Language: English
- Year: 2008
- Author: Charlie Harper
- Language: English
- Year: 1999
- Author: Charlie Harper
- Language: English
- Year: 1999
- Author: Marvin J. Greenberg John R. Harper
- Language: English
- Year: 1981
- Author: L. H. Harper
- Language: English
- Year: 2004
