Readings in marketing : the qualitative and quantitative areas
edited by Philip R. Cateora and Lee Richardson
Appleton-Century-Crofts, 1967
 Buku Teks SO
Creswell, John W.
Research design : qualitative, quantitative, approaches
Sage, 1994
 Buku Teks SO
Neuman, Lawrence W.
Basics of social research: qualitative and quantitative
Pearson New International edition, 2014
 Buku Teks SO
Napitupulu, Richard Bonardo
Analisis kualitatif implementasi knowledge management system pada perusahaan minyak dan gas bumi di Indonesia study case portal KOMET di PHE ONWJ = Qualitative analysis knowledge management system implementation in oil and gas company: study case komet portal at PHE ONWJ
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2019
 UI - Tesis Membership
Tashakkori, Abbas
Mixed methodology : combining qualitative and quantitative approaches
Sage, 1998
 Buku Teks SO