Hamlin, Christoper
Westeriew Press, 1993
Buku Teks
Carla Adityarini, author
Fakultas Hukum Universitas Indonesia, 2013
UI - Tesis (Membership)
Heady, Earl O., author
Iowa State University Press, 1969
Buku Teks
Schikele, Rainer, author
McGraw-Hill, 1954
Buku Teks
Tika Ramadhini, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2013
UI - Skripsi (Membership)