Filley, Alan C., author
Scott, Foresman, 1969
Buku Teks
Staudt, Thomas A.
Prentice-Hall, 1965
Buku Teks
Staudt, Thomas A.
Prentice-Hall, 1970
Buku Teks
Perrigo, A.E.B.
D.Van Nostrand , 1968
Buku Teks
Sayles, Leonard R., author
McGraw-Hill , 1964
Buku Teks