Marsden, William, author
Oxford University Press, 1984
Buku Referensi
Skeat, Walter W., author
The Clarendon Press, 1948
Buku Referensi
Kapliwatzky, Jochanan
Rubin Mass, 1941
Buku Teks
Cowan, H.K.J (Hendrik Karel Jan), author
Martinus Nijhoff, 1965
Buku Teks
Berg, Rene van den, author
Foris Publications, 1989
Buku Teks