Clarke, Hugh V.
Allen & Unwin, 1990
Buku Teks
edited by Chi-Chen Wang
Geoffrey Cumberlege Oxford University Press, 1947
Buku Teks
Hill and Wang , 1968
Buku Teks
Osho, author
Watkins Publishing, 2004
Buku Teks
Clarke, Arthur C.
Harper and Row, 1965
Buku Teks