Goodman, Philip, author
Oxford University Press, 2017
eBooks
Pine Forge Press, 1996
Buku Teks
Siegel, Larry J., 1959-, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Andrew Ashworth, Alison Macdonald, Ben Emmerson
Sweet & Maxwell , 2012
Buku Teks
Muhammad Adiguna Bimasakti, author
Universitas Indonesia, 2016
UI - Skripsi (Membership)