Παραπομπή APA

Szafran, R. F. (2012). Answering questions with statistics. Sage Publications, Inc.

Παραπομπή Chicago Style

Szafran, Robert F. Answering Questions with Statistics. Thousand Oaks: Sage Publications, Inc, 2012.

Παραπομπή MLA

Szafran, Robert F. Answering Questions with Statistics. Sage Publications, Inc, 2012.