Rolvaag, O.E., author
Harper & Row, 1965
Buku Teks
McConnell, David, author
McGraw-Hill, 2010
Buku Teks
Owen, Claudia, author
Brooks/Cole Cengage Learning, 2010
Buku Teks
Raden Ajeng Annisa Nirbito, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2012
UI - Skripsi (Open)
Indra Thurton P., author
Fakultas Teknik Universitas Indonesia, 2009
UI - Skripsi (Open)