Lyon, John K.
John Wiley & Sons, 1976
Buku Teks SO
Jaleel Ahmad
University of Pittsburgh, 1959
Buku Teks
Hesti Iswandari
Fakultas Kesehatan Masyarakat Universitas Indonesia, 2003
UI - Tesis Membership
Beeby, C. E.
Bharata Karya Aksara, 1984
Buku Teks
Davis, Jack
University Press of America, 1981
Buku Teks