Abercrombie, Stanley
Harper & Row, 1990
Buku Teks
Harrisberger, Lee
Calif., Brooks/Cole Pub. Co., 1966
Buku Teks
Kroes, Peter
Springer, 2012
eBooks
edited by John K. Ryan
The Catholic University of America Press, 1963
Buku Teks
Lamarque, Peter
Blackwell Publishing, 2009
Buku Teks