Online Writing Lab (OWL) at Purdue University

• APA Style Guide
• Guidelines for Interviews and other non-print resources
• Guidelines for Social Media (source - APA Style Blog)

Citing Sources / Create your Bibliography (UofT Libraries Guide)

• The guide includes links to many helpful online tutorials, style guides, and related documents to help you understand citation practice, and build correct citations for your bibliography.

Writing at the University of Toronto Advice

• Using sources: How Not to Plagiarize, Standard Documentation Formats,  Using Quotations, Paraphrase and Summary
• Student PDFs: Developing Coherent Paragraphs, Summarizing, Verbs for Referring to Sources, Wordiness: Danger Signals and Ways to React

Even if an image is free to use, be sure to follow these Best Practices for Attribution and give credit to the individuals who created the images. 

APA Style guide for Tables and Figures / Images

• Scroll down to "Images and Photographs" heading

Citation managers can help you:  

• collect the citation information for books, articles, websites, and more 
• automatically format in-text citations and bibliographies
• save the citation information, PDFs and notes in the cloud
• organize the research materials in folders or share folders with others

More info can be found in UofT Libraries Citation Management Guide (includes Mendeley) or this comparison chart of reference management software on Wikipedia for even more suggestions.