Woodward, Ralph Lee, author
Oxford University Press , 1985
Buku Referensi
Wheeler, Geoffrey
Bodley Head, 1966
Buku Teks
Csapo, Tamas, editor
Springer, 2012
eBooks
Danubian Press, 1970
Buku Teks
Ali Wardhana, author
[publisher not identified], [date of publication not identified]
Buku Teks