The CSE (Council of Science Editors) citation style is required for this assignment.
Use the "C-S Citation-Sequence" format.
To generate CSE Citation-Sequence citations using a free, online tool, try ZoteroBib. If you have the DOI, you can just enter that. If not, then manual entry will help you to generate the correctly styled citation.
You can also look at the rules and examples provided here:
UNC University Libraries -CSE / CBE Citing Information
List of Journal Abbreviations from Cal Tech.