Mollborn, Stefanie, author
Oxford University Press, 2017
eBooks
Khalila Yuniarto Suprapto, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2015
UI - Makalah dan Kertas Kerja
Seward, Georgene H
McGraw-Hill Book Company Inc, 1946
Buku Teks
Dwi Noverini Djenar, author
Faculty of Humanities University of Indonesia, 2014
Artikel Jurnal
Abbas Tashakkori, Charles Teddlie
SAGE Publications, 2010
Buku Teks