Place all parenthetical documentation at the end of the last sentence that uses information from the source.For example, if you write three sentences about how constellations were used by sailors, as long as the information in those three sentences came from the same source, then you do not need to include a citation after every one of the sentences. Instead, place the citation at the end of the group.
Include the last names of the authors of the work that you are citing as well as the date of publication in the parentheses. This information should be separated by commas and enclosed in the parentheses. For example, if your book about constellations is called _Maps of Stars_ , was published in 1999 and was written by Jody Noble and Lester Haley, then your sentence using information from that book should conclude with this citation:(Noble & Haley, 1999).
Place periods outside of the parentheses. Otherwise, it is not clear which sentence you are referencing with the citation. For example, a sentence might look like this:"Some stars and constellations could be counted on to remain steady in the sky, even as the ship moved around the globe (Noble & Haley, 1999)."
Include any information that is not in the sentence at the end inside the parentheses. Many writers like to directly credit authors in the text of their research. If you do this, then you only need to include the date of publication. For example, you might write a sentence like this:"Jody Noble and Lester Haley explain that some stars and constellations could be counted on to remain steady in the sky, even as the ship moved around the globe (1999)."Because you used the authors' names in the sentence, it was not necessary to repeat them in the citation.
Add page numbers where appropriate. Some professors like to know exactly where you found your information. If your instructor requires page numbers, just add them after the year of publication. Include all page numbers that had information used in the past section that you are citing. If you write 5 sentences about stars and navigation using the same source, then you need to add all of the page numbers at the end. Your final sentence might look like this:"Some stars and constellations could be counted on to remain steady in the sky, even as the ship moved around the globe (Noble & Haley, 1999, pp. 23-4, 57-60)."