Woodworth, George Walter
McGraw-Hill, 1950
Buku Teks
Fry, Maxwell J.
Routledge, 1997
Buku Teks
edited by Benyamin Haggott Beckhart
Columbia Universary Press, 1954, 1956
Buku Teks
Bradford, Frederick A.
Longmans, Green, 1932
Buku Teks
Thorne, W.J.
Oxford University Press , 1948
Buku Teks