Cita APA (7a ed.)

Pearson, H. C., & Kirchwey, M. F. (1921). Essentials of English: Lower grades. American Book Co.

Cita Chicago Style (17a ed.)

Pearson, Henry Carr, y Mary Frederika Kirchwey. Essentials of English: Lower Grades. New York, Cincinnati [etc.]: American Book Co, 1921.

Cita MLA (8a ed.)

Pearson, Henry Carr, y Mary Frederika Kirchwey. Essentials of English: Lower Grades. American Book Co, 1921.