Haggett, Peter, author
Harper & Row, 1975
Buku Teks
Carlson, Fred A., author
Prentice-Hall, 1952
Buku Teks
Charles E. Tutle Company, 1978
Buku Teks
Merken, Melvin, author
Saunders College Publishing, 1993
Buku Teks
Getis, Arthur, author
McGraw-Hill Higher Education, 2009
Buku Teks