UI - Publikasi
Spradley, James P.
Halt, Rinehart and Winston, 1979
Buku Teks
Gillham, Bill, author
Open University Press, 2008
Buku Teks
Bambang Prasetyo, author
RajaGrafindo Persada, 2007
Buku Teks
Kendall, Maurice, Sir, author
Charles Griffin, 1975
Buku Teks