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APA generally follows the basics of English grammar and writing mechanics. The official dictionary for spelling, including hyphenation and capitalization, is Merriam-Webster.com .
Pronouns and Voice:
APA allows limited use of first person. Use first person when discussing actions taken by you, the writer, directly. Use "I" for actions taken alone, use 'We" when referring to the actions of a group of authors, such as for a group project:
APA uses the singular "they" to refer to those of unknown gender, or those who self-select they as their pronoun.
Use only one space after punctuation, including end punctuation. Do use a space between initials. Do not use any spaces after periods in abbreviations that use them, or after the colon in a ratio.
Commas
The En Dash
The en dash ( – ) is used in numerical ranges and with compound adjectives of equal weight, for example author–date citation style. In particular, it is an en dash (–), not a hyphen (-), which appears in page number ranges in both in-text citations and references.


Hyphens
Periods
Abbreviations
Abbreviations shorten words, often using the first letters of the words in a name or title (acronyms).
Some types do not need to be defined, that is spelled out, in text even on the first use:
Introducing an Abbreviation or Acronym
Most abbreviations must be spelled out completely on initial appearance in the text.
Numbers
Capitalization
Capitalize the following:
Title Case
Title case is used on the title page, and for all titles, subtitles, and headings in the body—including the titles of figures or tables. Title case is also used for the titles of periodicals on the reference page.
Thus, in title case the only lowercase words should be articles ("a," "an," "the"), or short conjunctions or prepositions (e.g. "and," "but," "for," "if," "as," "to," "at," "by," "in"), unless they start a title or subtitle or if a preposition is used as an adverb or is part of a verb phrase.
Sentence Case
Sentence case is used for all titles other than periodical titles in the reference list.