Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Warning: These citations may not always be 100% accurate.