ECON 340: Environmental Economics

The OWL program at Purdue has some excellent instructional guides, among them this guide to APA explaining and showing examples for formating a research paper and citation styles.

The official American Psychological Association guide for referencing rules and paper formatting guidelines.

The APA Style Blog is the official companion to the Publication Manual of the American Psychological Association, Seventh Edition. It's run by a group of experts who work with APA Style every day. They publish weekly posts to talk about what we love—writing, publishing, and APA Style. They explore what APA Style is and how it works in a variety of areas, including reference citations of every sort, grammar and usage, the publication process, and social media. Occasionally they feature guest bloggers who write about more technical issues.