Cite

Who's there? Open the door! / Bruno Munari.

MLA

Munari, Bruno. Who's There? Open the Door! / Bruno Munari. World Publishing Company, 0AD. https://collections.library.yale.edu/catalog/17390344.

APA, 6th edition

Munari, B. (0 C.E.). Who's there? Open the door! / Bruno Munari. [Juvenile literature]. World Publishing Company. https://collections.library.yale.edu/catalog/17390344.