Garrison, Tom, 1942-, author
National Geographic Learning/Cengage Learning, 2016
Buku Teks
Gross, M. Grant, author
Prentice-Hall, 1972
Buku Teks
Thurman, Harold V.
Charles E. Merrill Publishing Company, 1975
Buku Teks
The Open University. Course Team
The Open University Press, 1984
Buku Referensi
The Open University. Course Team
The Open University Press, 1984
Buku Referensi