The informational site which includes helpful details concerning the rules, uses, and misuses of periods in the English language. Includes information about the period at the end of sentences as well as in abbreviations. Also, provides...

Helpful resource detailing the uses and misuses of the exclamation mark in English punctuation. Includes examples and a quiz following all three end mark sections.

This excellent resource provides information about rules, uses, and misuses of these three end marks (period, question mark, exclamation mark). Also, includes examples and short quizzes at the end of each section.

An excellent outline of the usage and rules concerning the "period" in English punctuation. Includes guidelines about acronyms, abbreviations, sentence ending, and more.