Srivastava, A.C., author
Vani Educational Books, [Date of publication not identified]
Buku Teks
Cochran, William G., author
Wiley, 1953
Buku Teks
Bründermann, Erik, author
Springer, 2012
eBooks
Stilwell, Alexander, author
Chancellor Press, 2000
Buku Referensi
Hopgood, F.R.A., author
Macdonald, 1969
Buku Teks