Robert L. Tignor, R. O. Collins
• 2004
André Djiffack, Aimée Bessire, Tiffany F. Jones, Wendy Urban-Mead, E. Ann McDougall, Timothy Cleaveland, Robert L. Tignor, Bonar A. Gow, Christel MANNING, Villia Jefremovas, John Flint, Kathleen Sheldon, Udo Krautwurst, Donald Rothchild, Scott Brunger, Bonny Ibhawoh, Lidwien Kapteijns, Peter Limb, M. Owino, Pauline E. Peters, Fiona C. Ross, Justin Willis, Mahir Şaul, S. Boni, A. Verdoolaege, M. Epprecht, W. Reno
• 2004
Robert L. Tignor, Toyin Falola
• 2003
Marie-Madeleine Farma, Titi Adepitan, Ian S. Spears, R. Kiki Edozie, Gail Presbey, Barnabe Ndarishikanye, Kate B. Showers, Robert L. Tignor, Charles W. Hartwig, Elaine Windrich, Roger B. Beck, F. K. Ekechi, Barbara Oomen, Olusola Ojo, Peter Limb, Tim Stapleton, Gary Kynoch, Olufemi Vaughan, G. Elder, J. Abbink, A. Verdoolaege, C. Coquery-Vidrovitch, C. Young, T.M. Shaw
• 2003
Ebere Nwaubani, Robert L. Tignor
• 2002
Michael C. Brose, Deborah Fahy Bryceson, J. I. Dibua, Awad M. Ibrahim, Miroslav Koziel, Suzanne Dansereau, Anne Décoret-Ahiha, Paula Midgley, Raymond R. Gervais, Clifford English, Robert L. Tignor, Maurice N. Amutabi, Jeremy Seekings, Sophie Dulucq, Clive J. Napier, JOHN CARTWRIGHT, Stephen J. Rockel, Wisdom J. Tettey, M. Owino, Barry Hallen, M. Terretta, M.A. Klein, F. Becker, B. Riddell, R. Sandbrook
• 2002
Robert L. Tignor, John Flint
• 1998
Robert L. Tignor
• 1990