Ley, Willy
Dragon in amber : further adventures of a romantic naturelist/ Willy Ley
The Viking Press, 1951
 Buku Teks
Rezendes, Paul
The wild withinh : adventures in nature and animal teachings / Paul Rezendes
Berkeley Books , 1998
 Buku Teks
Ratri Candra Restuti, author
Tingkat daya tarik objek wisata alam di Kabupaten Kebumen = Attraction level of natural tourist resorts in Kebumen Regency
Universitas Indonesia, 2008
 UI - Skripsi (Open)
Quammen, David
Natural acts : a sidelong view of science and nature
Schocken Books , 1985
 Buku Teks
Morrison, Tony, author
The Andes
Time-Life Books, 1975
 Buku Teks
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