What are the key principles and guidelines for implementing Harvard style footnoting in academic writing?

The key principles for implementing Harvard style footnoting in academic writing include citing sources in the text with the author's last name and year of publication, providing a full reference list at the end of the paper, and using a consistent citation style throughout the document. Guidelines include including page numbers for direct quotes, using et al. for multiple authors, and alphabetizing the reference list by the author's last name.