Readings in marketing : the qualitative and quantitative areas
edited by Philip R. Cateora and Lee Richardson
Appleton-Century-Crofts, 1967
 Buku Teks
Neuman, Lawrence W.
Basics of social research: qualitative and quantitative
Pearson New International edition, 2014
 Buku Teks
Creswell, John W.
Research design : qualitative, quantitative, approaches
Sage, 1994
 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
Neuman, William Lawrence, 1950-
Social research methods: qualitative and quantitative approaches
Allyn and Bacon, 2003
 Buku Teks