Robinson, James H.
Endang, 1956
Buku Teks
Moss, Morris H.
McGraw-Hill, 1980
Buku Teks
Peter, J. Paul, author
Plano, Tex. Business Publication 1982,
Buku Teks
Rewoldt, Stewart H.
Rineka Cipta, 1995
Buku Teks
Champion, John M.
Richard D. Irwin, 1985
Buku Teks