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Physical Science: Citation

Lib-guide for Physical Science courses.

Understanding Citation Style

3 Writing Styles: APA, Chicago, & MLA


APA by Purdue (click here to access)
The Online Writing Lab (OWL) at Purdue University houses writing resources and instructional material, and we provide these as a free service of the Writing Lab at Purdue. Students, members of the community, and users worldwide will find information to assist with many writing projects. Teachers and trainers may use this material for in-class and out-of-class instruction.
List by Discipline (click here to access)
This handout provides an exhaustive list of style guide information for documenting sources in different disciplines. The handout is organized by discipline and includes both a link to the main organizational website and also a link for an online guide to using that style.
MLA Citation Basics (click here to access)
MLA by Purdue (click here to access)
MLA (Modern Language Association) style is most commonly used to write papers and cite sources within the liberal arts and humanities. This resource, updated to reflect the MLA Handbook (8th ed.), offers examples for the general format of MLA research papers, in-text citations, endnotes/footnotes, and the Works Cited page.
OWL Purdue (click here to access)

Welcome to the Purdue OWL. We offer over 200 free resources including:

  • Writing and Teaching Writing
  • Research
  • Grammar and Mechanics
  • Style Guides
  • ESL (English as a Second Language)
  • Job Search and Professional Writing

Avoid Plagiarism


Citation for beginners

In-Text Citation