Cita APA

Gagg, M. (1959). Numbers: A Ladybird learning to read book. [S.l.]: Ladybird Books.

Citación estilo Chicago

Gagg, M.E. Numbers: A Ladybird Learning to Read Book. [S.l.]: Ladybird Books, 1959.

Cita MLA

Gagg, M.E. Numbers: A Ladybird Learning to Read Book. [S.l.]: Ladybird Books, 1959.