Wild, Ray
Holt, Rinehart and Winston , 1975
Buku Teks
Stevenson, William J.
Boston: McGraw-Hill, 1999
Buku Teks
Buffa, Elwood S. (Elwood Spencer)
John Wiley & Sons, 1971
Buku Teks
Buffa, Elwood S. (Elwood Spencer)
John Wiley & Sons, 1973
Buku Teks
Hoffmann, Thomas R.
Wadsworth, 1967
Buku Teks