Muir, Robert
Henry Frowde, Hodder & Stoughton, 1921
Buku Teks
Browning, Carl H.
Oxford University Press, 1937
Buku Referensi
Toennies, Klaus D.
Springer, 2012
eBooks
World Health Organization, 1991
Buku Teks
Chatton, Milton
University Medical Publishers, 1949
Buku Referensi