Sagan, Carl, author
Simon and Schuster , 1985
Buku Teks
Belinda Laila Caesar, author
2019
UI - Skripsi (Membership)
Sagan, Carl, author
Presidio Press, 1980
Buku Teks
Elex Media Komputindo, 2013
Buku Teks
edited by Philip Stevick
Free Press, 1967
Buku Teks