Bittker, Boris I.
Federal Tax Press, 1968
Buku Teks
Eljinah Anderson, editor ; Dougkas S. Massey, editor
Ruseel sage foundation, 2001
Buku Teks
United Nations, 1970
Buku Teks
Chicago, Ill. Commerce Clearing House 1966,
Buku Teks
Tobias Soebekti
Indiana University, 1964
Buku Teks