Kramers, Johannes Hendrik, editor
Amsterdam Elsevier Brussel, 1956
Buku Teks
Swales, John M., author
The University of Michigan Press, 2004
Buku Teks
Goldberg, Natalie, author
Mizan, 2005
Buku Teks
Nivardus, Magister
Utrecht De Haan 1946
Buku Teks
Eleosser, A
Amsterdam Elsevier 1924
Buku Teks