Cita APA (7a ed.)
Eckersley, C. E. (1951). Essential english: Book one. Longman.
Cita Chicago Style (17a ed.)
Eckersley, C. E. Essential English: Book One. London: Longman, 1951.
Cita MLA (9a ed.)
Eckersley, C. E. Essential English: Book One. Longman, 1951.
Precaución: Estas citas no son 100% exactas.