Beatty, Richard H.
John Wiley & Sons, 1995
Buku Teks
editors, Jaber F. Gubrium, James A. Holstein
Sage, 2002
Buku Referensi
Magnusson, Eva, author
Cambridge University Press, 2015
eBooks
edited by Philip M. Hauser and Otis Dudley Duncan
The University of Chicago Press, 1959
Buku Teks
Shenkel, William M., author
McGraw-Hill , 1978
Buku Teks