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