Memorial University Libraries Guide to APA
This set of instructional videos contain the basics of APA style referencing. Very simple, clear and informative.

Purdue Owl Guide to APA Referencing
This link leads you to Purdue Owl guide concerning APA referencing. Very informative.

APA Style Central
A very useful resource center for APA style

University of Southern Queensland APA Referencing Guide
This link has lots of examples and instructions on APA style referencing

EasyBib Guide to APA Format Papers
This link has lots of clear and easy-to-understand instructions on APA style referencing

BibMe Online Plagiarism Checker
This link enables you to do quick checks with your scientific writing. BibMe checks your text for possible accidental prlagiarism and gives you suggestions on grammar and writing style. 

Citation Machine Online Plagiarism Checker
Like the link above, this link enables you to do quick checks with your scientific writing. Citation Machine checks your text for possible accidental prlagiarism and gives you suggestions on grammar and writing style. 

TypeCite
Like the links above, this webpage can give you very useful instructions on APA style referencing. See the helpful subpages by clicking the "APA" in the upper bar.

Short Examples of APA
This Jyväskylä University website gives you small examples of APA style in Finnish