Bok, A.J.
Kluwer, 1986
Buku Teks
Adriani, Pieter Jacob Albert, 1879-, author
L.J. Veen, 1954
Buku Teks
Perry, J. Harvey
University of Toronto Press, 1953
Buku Teks
Viersen, J.
G. C. T. van Dorp, 1952
Buku Klasik
Gumpel, Henry J.
Commerce Clearing House, 1969
Buku Teks