Smith, Lee H.
Wadsworth, 1971
Buku Teks
Smith, Lee H.
Belmont, Cal Wadsworth Pub. Co. c.1971,
Buku Teks
Bryant, Edward C., author
McGraw-Hill Book , 1966
Buku Teks
Erickson, Roy V., author
Allyn and Bacon, 1985
Buku Teks
Kuebler, Roy R., author
John Wiley & Sons, 1976
Buku Teks