Bell, Earl H.
Harper & Row, 1965
Buku Teks
Rose, Arnold M., author
Alfred A.Knopf, 1969
Buku Teks
Lundberg, George Andrew
D. McKay Co, 1964
Buku Teks
Hobbs, Donald A., author
John Wiley & Sons, 1982
Buku Teks
Johnson, Allan G., author
Harcourt Brace, 1986
Buku Teks