Write the citation at the end of each line when the bulleted items are each a separate sentence. Use the traditional MLA parenthetical formatting. Place the last name of the author, a space, and then the page number inside parenthesis at the end of the line containing the fact needing the citation. An example is: (Davis 243).
Write the citation at the end of the last line of bullets when the bulleted lines are created as a part of a long sentence. Place the last name of the author, a space and the page number on which the cited information is found in parenthesis. Follow it with the end punctuation. An example is: (Davis 243).
Mention the author's name in the sentence leading preceding the colon before the bulleted list. Once this is done, you don't have to perform the traditional citation. Enclose the page number on which the facts cited are found, in parenthesis. For example, your in-text citation may read (243). Any punctuation follows the closed parenthesis.