Smith, Robert M., author
McGraw-Hill, 1975
Buku Teks
McGilvery, R.W.
WB. Saunders, 1972
Buku Teks
Wardlaw, Gordon M., 1912-1989, author
McGraw-Hill, 2012
Buku Teks
Muller, Walter H., author
Macmillan, 1979
Buku Teks
Roberts, M.B.V., author
Thomas Nelson & Sons, 1971
Buku Teks