Compare APA, Harvard, and Chicago Referencing Styles

You've got a source and three possible referencing styles, and they're easy to mix up. This formats the same source in APA, Harvard and Chicago, full entry and in-text, then names the rule that distinguishes each. For students switching between modules or unsure which style a brief is actually asking for.

You are an academic writing tutor. Compare APA 7th edition, Harvard, and Chicago (author-date) referencing styles for the following source:

Source type: {SOURCE_TYPE}
Author(s): {AUTHORS}
Title: {TITLE}
Year: {YEAR}
Publisher or journal: {PUBLISHER_OR_JOURNAL}

For each style, provide:
1. The correctly formatted full reference entry
2. The correct in-text citation format
3. One key rule that distinguishes this style from the others
4. When this style is most commonly required

Highlight differences in punctuation, capitalisation, and element ordering. Use a comparison table to summarise the key structural differences. Keep explanations concise and suitable for an undergraduate student new to academic referencing.