Hunter, John, author
Routledge, 2005
Buku Teks
Vold, George B. (George Bryan), 1896-1967, author
Oxford University Press, 1979
Buku Teks
Haver, F. Schmidt
H.A.M. Roelants, 1881
Buku Teks
Gouda Quint, 1983
Buku Teks
Peters, A. A. G., author
Kluwer, 1966
Buku Teks