edited by Andreas Bandak and Lars Hojer
John Wiley & Sons, 2015
Buku Teks
edited by Donald D. Wood
Emerald, 2016
eBooks
Hollander, Stanley C.
Michigan State University , 1960
Buku Teks
Willis, James F.
North West Publishing, 2002
Buku Teks
Dimen-Schein, Muriel
McGraw-Hill, 1977
Buku Teks