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This question already has an answer here:

It's about using the right punctuation when abbreviation is used at the end of sentence. It has been asked here when the sentence is a question: How to deal with abbreviations at the end of a question?.

What about sentences like the following:

The opinions of this articles are those of the author(s),
and do not necessarily reflect the views of Google Inc..

Two dots or one dot?

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marked as duplicate by RegDwigнt Sep 23 '13 at 20:07

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Common practice is to use only one period at the end of a sentence when an abbreviation would use a period. For other punctuation, such as a comma or semicolon, both the abbreviation's period and the other punctuation mark would typically be used. The issue might often be avoided by expanding the abbreviation.

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