Helweg, H. (1978). The Old Woman and her Pig. Oxford University Press.
Cita Chicago Style (17a ed.)Helweg, Hans. The Old Woman and Her Pig. Oxford: Oxford University Press, 1978.
Cita MLA (9a ed.)Helweg, Hans. The Old Woman and Her Pig. Oxford University Press, 1978.
Precaución: Estas citas no son 100% exactas.