Hoffman, E. Kenneth, author
Wadsworth, 1990
Buku Teks
Lattimore, Dan, author
Morton , 1990
Buku Teks
Scott, Joan E., author
John Wiley & Sons, 1982
Buku Teks
Hill, Francis S., author
Macmillan, 1990
Buku Teks
Hearn, Donald, author
Prentice-Hall, 1986
Buku Teks