edited by Heike Oevermann and Eszter Gantner
Routledge, 2020
Buku Teks
Carfax Publishing Company, 2018
Majalah, Jurnal, Buletin
Birkhauser verlag, 1998
Buku Teks
Rasmussen, David W.
Harper & Row , 1973
Buku Teks
Kennedy, Leslie W
McGraw-Hill Ryerson, 1983
Buku Teks