Jarvis, Peter J.
Prentice-Hall, 2000
Buku Teks
edited by S.E. Jorgensen, B. Halling-Sorensen, S.N. Nielsen
Lewis Publishers, 1996
Buku Referensi
edited by J. Rozema and J.A.C. Verkleij
Kluwer Academic , 1991
Buku Teks
Withers, Philip C.
Oxford University Press, 2016
eBooks
edited by Marie D. Hoff and John G. McNutt
Avebury, 1994
Buku Teks SO