Bernard, Cicero H.
John Wiley & Sons, 1995
Buku Teks SO
Sherman, Alan
Houghton Mifflin, 1976
Buku Teks SO
Adams, Roger, 1889-1971
McMillan, 1963
Buku Teks
Webster, Murray
Academic Press, 2014
eBooks
Rao, Guthikonda V.
Van Nostrand Reinhold, 1982
Buku Teks SO