Kwan, Kevin
Doubleday, 2017
Buku Teks SO
Richards, Jack C.
Cambridge University Press, 1985
Buku Teks SO
Hadley, Alice Omaggio
Heinle Cengage Learning, 2001
Buku Teks SO
edited by Stephen Creanor
John Wiley & Sons, 2016
Buku Teks SO
World Health Organization, 1980
Buku Teks