Werbach, Melvyn R.
Thorsons, 1993
Buku Referensi
Pitchford, Paul
North Atlantic Books, 2002
Buku Teks SO
Lu, Henry C.
Sterling Pub. Co, 2000
Buku Teks SO
Ensminger, Audrey; Ensminger, M.E.; Konlande, James E.; Robson, John R.K.
CRC Press, 1994
Buku Referensi
L. Kathleen Mahan, Sylvia Escott Stump, editors
Elsevier Mosby, 2012
Buku Teks SO