Khabaza, I.M.
Pergamon Press, 1965
Buku Teks SO
Burden, Richard L.
Brooks/Cole Cengage Learning, 2011
Buku Teks SO
Walter Gautschi
Springer, 2012
eBooks
Burden, Richard L.
Cengage Learning, 2016
Buku Teks SO
Froberg, Carl-Erik
Addison-Wesley, 1972
Buku Teks SO