APA引文

Powers, O. M. (1890). The practical speller: Especially designed for use in commercial education. O.M. Powers.

Chicago Style (17th ed.) Citation

Powers, O. M. The Practical Speller: Especially Designed for Use in Commercial Education. Chicago: O.M. Powers, 1890.

MLA引文

Powers, O. M. The Practical Speller: Especially Designed for Use in Commercial Education. O.M. Powers, 1890.