Below are some useful resources to assist with writing, punctuation, grammar, spelling, word usage and citing and referencing:
Academic Skills contains pdf documents on topics such as Writing, Research, Reference and Language (The University of Melbourne)
General Writing Resources (OWL - Online Writing Lab - Purdue University)
Resources (Macquarie Dictionary)
Punctuation Guide (Macquarie Dictionary)
The Punctuation Guide (please see: http://www.thepunctuationguide.com/index.html)
Punctuation helps sentence structure (The University of Melbourne) (PDF document)
The Blue Book of Grammar and Punctuation
Spelling (Oxford Dictionaries)
Usage (Oxford Dictionaries)