Use a period after a mild imperative or exclamation:
A sentence that is interrogative in form may be imperative in function and thus take a period (see 7.10 Requests, indirect questions and other uses):
Indirect questions are affirmative sentences and take a period, not a question mark (but see 7.10 Requests, indirect questions and other uses):
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Ayuda a la redacción – The Canadian Style
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