International Textbook Company, 1968
Buku Teks
Dougan, Dennis L.
London Sweet & Maxwell, Limited 1951,
Buku Teks
Foster, Dennis L., author
McGraw-Hill, 1992
Buku Teks
Dougan, Dennis L.
Sweet & Maxwell , 1951
Buku Teks
Elsevier Saunders, 2012
Buku Teks