By David Rayner, Michael White
By Will H. Moore, David A. Siegel
By Thomas Dietz (Michigan State University, USA), Linda Kalof (Michigan State University, Amy Dan
By Cindy Neuschwander, Wayne Geehan
By J. A. L. Matheson, N. W. Murray, R. K. Livesley
By David Baker, etc., Jim Griffith, Paul Hogan, Chris Humble
By Louda, Jiri, Maclagan, Michael
By William G. Dauben
By William G. Dauben (University of California, Berkeley)
By Norman Dyson
By Walker, Peter M.B.
By Collins GCSE
By Mark Patmore, Eddie Wilde, Jean Matthews, Howard Baxter, John Jeskins
By James M. Russell
By David C Peaslee
By Yvonne Gostling, Bob Hartman, Howard Johnson, Jean Matthews, Michael Handbury
By Arthur Griffith
By D. Murray, D. Benjamin
By George S. Tselikis (4Plus company, Athens, Greece), Nikolaos D. Tselikas (University of Peloonnese, Tripolis
By Lucy Simonds, Jo Chambers
By Carol Ash (University of Illinois at Urbana-Champaign), Robert B. Ash
By Shein-Chung Chow, Jen-pei Liu
By Fiehn, Terry
By National Audubon Society
By E.B. Jackson
By Ray Meddis
By MATHAI, Am
By GAIER
By Ron Larson (The Pennsylvania State University, The Behrend College)