APA

Krauss R., Simont M., . (1949). The happy day. New York: Harper.

Chicago

Krauss Ruth, Simont Marc, . 1949. The happy day. New York: Harper.

Harvard

Krauss R., Simont M., . (1949). The happy day. New York: Harper.

MLA

Krauss Ruth, Simont Marc, . The happy day. New York: Harper. 1949.