Strict APA format gives page numbers only for actual quotations, not for paraphrases or summaries, though modified formats in other disciplines do use them for all references. Ask your instructor whether you should include page numbers. Ask your instructor if you are expected to follow the APA manuscript rules, or whether you should imitate the formats seen in printed journal articles. Guided language acquisition among chimpanzees. Other sciences and applied sciences use parenthetical numbers in the text of the paper, matching a numbered list of sources at the end.
Exact formats vary.
Look at copies of journals in your discipline to see formatting details, including distinctive punctuation, compressed spacing, and lack of underlining or italics. Your professor may ask you to imitate the format used in a specific journal. The system shown here, widely used in the medical sciences, was invented by editors at a meeting in Vancouver. The full set of directions for publishing in medical journals is available online, courtesy of the Canadian Medical Association . It includes a few examples of electronic material considered acceptable as sources.