Cameron, Derek, author
Reston, 1978
Buku Teks
Terrell, David L., author
Butterworth-Heinemann, 1996
Buku Teks
Jeffcoate, Judith, author
Prentice Hall, 1995, 1995
Buku Teks
Chakraborty, Tamal, author
Springer Cham, 2019
eBooks
McGlynn, Daniel R., author
John Wiley & Sons, 1976
Buku Teks SO