Intersentia, 2017
eBooks
Kubasek, Nancy K., author
Pearson - Prentice Hall, 2005
Buku Teks
McCaffrey, Stephen C., author
Thomson/West, 2009
Buku Teks
Doelle, Meinhard, author
Carswell, 2009
Buku Teks
Kiss, Alexandre Charles, 1925-, author
Grotius Publications Limited, 1993
Buku Referensi