Stitt, Fred A.
McGraw-Hill, [date of publication not identified]
Buku Teks
Earle, James H.
Addison-Wesley, 1986
Buku Teks
Weidhaas, Ernest R.
Allyn and Bacon, 1989
Buku Teks
Hepler, Donald E.
McGraw-Hill, [1965]
Buku Teks
Bishop, Calvin C.
McGraw-Hill, 1952
Buku Teks