Should be in the last part of the article (before any attachments/appendixes), in alphabetical order, according to American Psychological Association (APA) style.
1. Article
Arize, A. C. (1994). A re-estimation of the demand for money in small developing economy.Applied Economics, 26, 217-28.
Blyton, P. & Turnbull, P. (1998).The Dynamics of Employee Relations, 2nd ed., London: McMillan Press Ltd.
2. Conference Proceeding
Wilkinson, R. (1999). Sociology as a marketing feast. In M. Collis, L. Munro, & S. Russell (Eds.), Sociology for the New Millennium. Papers presented at The Australian Sociological Association, held at Monash University, Melbourne, 7-10 December (pp. 281-289). Churchill, Victoria: Celts.
3. Book
Treviño, L. K., & Nelson, K. A. (2007).Managing business ethics: Straight talk about how to do it right. Hoboken, NJ: Wiley.