Blackwell Publishing,
Majalah, Jurnal, Buletin
Brachet, Michelle, author
Ruckus Books, 2014
Buku Referensi
Johnson, George B., author
McGraw-Hill, 2018
Buku Teks
Michelle Brachet, author
Ruckus Books, 2014
Buku Referensi
edited by Stewart Sutherland, Leslie Houlden, Peter Clarke, Friedhelm Hardy
Routledge, 1988
Buku Referensi