Leopold, Luna B., author
Dover, 1995
Buku Teks
Carlson, Fred A., author
Prentice-Hall, 1952
Buku Teks
Charles E. Tutle Company, 1978
Buku Teks
Getis, Arthur, author
McGraw-Hill Higher Education, 2009
Buku Teks
Unwin, Tim, author
Longman Scientific & Technical, 1992
Buku Teks