Antoniades, Anthony C.
John Wiley & Sons, 1992
Buku Teks SO
Colletti, Marjan
Ashgate Publishing Limited, 2013
Buku Teks SO
Daab, 2006
Buku Teks SO
Hepler, Donald E.
McGraw-Hill, 1965
Buku Teks SO
Gemmy International
Words & Visuals Press Pte Ltd, 2011
Buku Referensi