Asbjørnsen, P. C., & Galdone, P. (1973). The three billy goats Gruff. Clarion Books.
Cita Chicago Style (17a ed.)Asbjørnsen, Peter Christen, y Paul Galdone. The Three Billy Goats Gruff. New York: Clarion Books, 1973.
Cita MLA (8a ed.)Asbjørnsen, Peter Christen, y Paul Galdone. The Three Billy Goats Gruff. Clarion Books, 1973.
Precaución: Estas citas no son 100% exactas.