Asimov, Isaac, author
Faweett World Library , 1967
Buku Teks
Asimov, Isaac, author
Grafton Books, 1990.
Buku Teks
Asimov, Isaac, author
Collier Books, 1962
Buku Teks
Asimov, Isaac, author
Gunung Agung, 1958
Buku Teks
Asimov, Isaac, author
Greenwood Press , 1979
Buku Teks