Neuman, Lawrence W., author
Pearson New International edition, 2014
Buku Teks
Lofland, John, author
Wadsworth, 1971
Buku Teks
Lofland, John, author
Wadsworth, 1984
Buku Teks
edited by Martin Bulmer
Macmillan, 1984
Buku Teks
Speziale, Helen J. Streubert, author
J.B. Lippincott, 1999
Buku Teks