Waddell, Joseph J., author
McGraw-Hill, 1985
Buku Referensi
Kaufman, Milton
McGraw-Hill, 1988
Buku Referensi
Lenk, John D., author
Reston , 1978
Buku Referensi
Middleton, Robert Gordon, 1908-, author
Reston Publishing, 1970
Buku Referensi
Markus, John, 1911-, author
McGraw-Hill, 1982
Buku Teks