edited by Philip M. Hauser and Leo F. Schnore
John Wiley & Sons, 1965
Buku Teks
Dixon, D. F.
Longman Cheshire , 1982
Buku Teks
McGraw-hill Open Univ. press , 2006
Buku Teks
Wilkinson, Edward J., author
Wolters Kluwer Health, 2012
Buku Teks
Wilkinson, Caroline
Cambrigde University Press , 2008
Buku Teks