Kelly, Lucie Young
London MacMillan 1975 , 1975
Buku Teks
Alhashim, Dhia D., author
PWS-Kent , 1988
Buku Teks
edited by James F. Short
Sage, 1986
Buku Teks
Anderson, Nels
David Mckay Co.Inc, 1964
Buku Teks
Gilbert, Neil, author
Prentice-Hall, 1986
Buku Teks