Each of these statements are False.
1) You should always choose the most recent date for copyright dates on a Works Cited entry because it will contain the most up-to-date information, editing, and edition of the cited work entry itself.
2) The mark of punctuation that most often ends the Works Cited entry is a pair of parentheses. (A period will come after the closing parentheses to mark the end of the sentence quoting the excerpt from the Works Cited entry itself.)
3) Wikipedia is not considered a scholarly source. Wikipedia is a tertiary source--which one should consider using only after primary and secondary sources for their research and reliable information.
4) Technically, proofreading is not considered a crucial process for academic papers--even though it really does help your writing become all the more smooth-flowing, on-topic, and intact in terms of grammar and overall syntax.
I hope this helps!