Ferendeci, Altan M., author
McGraw-Hill, 1991
Buku Teks
Leonard, Karen Isaksen, author
Sage, 2003
Buku Teks
edited by Ronald Cohen and Elman R. Service
Institute for the Study of Human Issues, 1978
Buku Teks
Nathan Hall, Abbee Corb, Paul Giannasi and John G. D. Grieve; foreword by Neville Lawrence, OBE., editors
Routledge, 2015
Buku Teks
Ladd, M.F.C., author
Ellis Horwood, 1979
Buku Teks