Citing a Textbook Using MLA Style. 1  1. Insert an in-text citation. Place the in-text citation in parentheses, as soon as possible after the quote or clause being referenced. 2  2. Cite the textbook on the Works Cited page. Include all of the following information, or as much as is available to you, in the Works Cited entry for each textbook: Author's name, last name first, ending with a period.