APA
Stewart David W, Shamdasani Prem N, . (1990). Focus group : Theory and practice. New Delhi: Sage Publications.
Chicago
Stewart David W, Shamdasani Prem N, . 1990. Focus group : Theory and practice. New Delhi: Sage Publications.
Harvard
Stewart David W, Shamdasani Prem N, . (1990). Focus group : Theory and practice. New Delhi: Sage Publications.
MLA
Stewart David W, Shamdasani Prem N, . Focus group : Theory and practice. New Delhi: Sage Publications. 1990.