Macintryre, Ewan, author
Blackstone Press, 1998
Buku Referensi
Healy, Nicholas J., author
St. Paul, Minn, 1977
Buku Teks
Healy, Nicholas J., author
[Publisher not identified], 1986
Buku Teks
Murray, John Edward, author
Bobbs-Merrill, 1976
Buku Teks
edited by S.M. Waddams
University of Toronto Press, 1971
Buku Teks