Elsevier Science Inc., 660, 2018
Majalah, Jurnal, Buletin
Gazda, Istvan, author
Kluwer Law International, 1996
Buku Teks
edited by S. M. Sze
McGraw-Hill , 1983
Buku Teks
Sethi, H. M.
New Delhi: Tata McGraw-Hill, 1991
Buku Teks
Neville, Adam M., author
Longman Scientific and Technical, 1987
Buku Teks