Παραπομπή APA

Hunia, F. (1977). Billy goats gruff. Laybird Books.

Παραπομπή Chicago Style

Hunia, Fran. Billy Goats Gruff. Loughborough: Laybird Books, 1977.

Παραπομπή MLA

Hunia, Fran. Billy Goats Gruff. Laybird Books, 1977.