Lieberman, Norman P.
Penwell Publishing Company, 1981
Buku Teks
R. BG. Hudy Prabowo Edyson, author
Sekolah Kajian Stratejik dan Global Kajian Ilmu Lingkungan, 2019
UI - Tesis (Membership)
Dina Yusdiana, author
Poltekkes Kemenkes Medan Jurusan Keperawatan, 2011
Artikel Jurnal
Billington, David P., author
Basic Books, 1983
Buku Teks
edited by Karl Hurrle, F.M. Jablonski and Herbert Roth
Pergamon Press, 1972
Buku Referensi