McCarthy, David J.
St.Paul,Minn., 1995
Buku Teks
Wiseman, H. Victor
Routledge and Kegan Paul, 1967
Buku Teks
edited by Herbert L. Marx
H.W. Wilson, 1962
Buku Teks
Jackson, R.M. (Richard Meredith), 1903-1986, author
Macmillan, 1959
Buku Teks
Ball, Alan R., author
Macmillan, 1974
Buku Teks