Hill, Susan, author
Longman, [date of publication not identified]
Buku Teks
Safina Meida Baqo, author
Fakultas Hukum Universitas Indonesia, 2014
UI - Skripsi (Membership)
Ganic, Ejup N., author
McGraw-Hill, 2003
Buku Teks
editor, Harry Helms [and others]
McGraw-Hill, 1983
Buku Referensi
Maimon, Elaine P., author
McGraw-Hill, 2012
Buku Referensi