Lee, Betty
Simon & Pierre, 1982
Buku Teks
University League for Social Reform; edited by Peter Russell
McGraw-Hill, 1966
Buku Teks
Backing, Richard C
James Lewis ,
Buku Teks
by Jack Bavington
Maclean-Hunter Learning Materials, 1976
Buku Teks
Ottawa Departemen of External Affairs 1963
Buku Teks