Asimov, Isaac, author
Doubleday, 1964
Buku Referensi
Ferling, John, author
Oxford University Press, 2003
Buku Teks
d`Alpuget, Blanche, author
Aurora Press, 1980
Buku Teks
Sargent, Sarah, author
Four Winds Press, 1984
Buku Teks
Crouch, Blake, Author
Noura books, 2017
Buku Teks