Vasta, Ross, author
John Wiley & Sons, 1999
Buku Teks
Merken, Melvin, author
Saunders College Publishing, 1993
Buku Teks
Holton, Gerald, author
Adison-Wesley, 1958
Buku Teks
Ramsey, William L., author
Holt, Rinehart and Winston, 1961
Buku Teks
Bierstedt, Robert, author
McGraw-Hill, 1964
Buku Teks