Creamer, H. Robert
Addison-Wesley Pub. Co., 1984
Buku Teks
Spotts, M.F. (Merhyle Franklin), author
Prentice-Hall, 1981
Buku Teks
Spotts, M.F. (Merhyle Franklin), author
Prentice-Hall, 1971
Buku Teks
Faires, Virgil Moring
Macmillan, 1965
Buku Teks
Black, Paul H.
McGraw-Hill, 1968
Buku Teks