Cita APA (7a ed.)

Sin Autor. (1926). The Royal Readers Nº4. Nelson and sons.

Cita Chicago Style (17a ed.)

Sin Autor. The Royal Readers Nº4. Edinburgh: Nelson and sons, 1926.

Cita MLA (9a ed.)

Sin Autor. The Royal Readers Nº4. Nelson and sons, 1926.