Block quotations contain an exception to the rule for using what punctuation mark in citations?

Block quotations contain an exception to the rule for using periods in citations.

Here's why:

* Standard rule: In a standard citation, the period goes *after* the closing parenthesis of the citation.

* Block quote exception: When a citation is at the end of a block quote, the period goes *before* the closing parenthesis of the citation.

Here's an example:

Standard citation:

> "The quick brown fox jumps over the lazy dog." (Smith 2023)

Block quote citation:

> "The quick brown fox jumps over the lazy dog. This is a long sentence to illustrate the block quote format." (Smith 2023).

This rule helps to maintain visual clarity and consistency in formatting.