edited by Reiner Horst, Panos M. Pardalos
Kluwer Academic Publishers, 1995
Buku Referensi
edited by David I. Cleland, Roland Gareis
McGraw-Hill, 1994
Buku Referensi
Routledge, 2015
eBooks
edited by Susan E. Israel, Gerald G. Duffy
Routledge, 2009
Buku Referensi
Lawrence Erlbaum Associates, 2004
Buku Teks