edited by Robert L. Jeanne
Westview Press, 1988
Buku Teks
Saunders, D.S., author
Pergamon Press, 1982
Buku Teks
edited by Kostas Bourtzis and Thomas A. Miller
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Nation, James L., author
CRC Press, Taylor & Francis Group, 2008
Buku Teks
Daly, Howell V., author
McGraw-Hill, 1978
Buku Teks