Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2004
UI - Skripsi (Membership)
Hans Hagerdal, author
University of Indonesia, Faculty of Humanities, 2012
Artikel Jurnal
Wood, Michael, author
Ombak, 2013
Buku Teks
Haekel Prashatya, author
Fakultas Psikologi Universitas Indonesia, 2015
UI - Skripsi (Membership)
Horwitz, William, editor
Association of Official Agricultural Chemists, 1955
Buku Referensi