Alan Lewis, author
Cambridge University Press, 2018
eBooks
Landy, Frank J., author
The Dorsey Press, 1980
Buku Teks
edited by P.J.D. Drenth ... [and others]
Wiley, 1984
Buku Teks
Maria C.W. Peeters, Jan de Jonge and Toon W. Taris, editors
Wiley-Blackwell, 2014
Buku Teks
edited by Pieter J.D. Drenth, Henk Thierry, Charles J. de Wolff
Routledge, 1998
Buku Referensi