APA (7th ed.) Citation

Acker, H. (1970). Four sons of Norway. Books for Libraries Press.

Chicago Style (17th ed.) Citation

Acker, Helen. Four Sons of Norway. Freeport, N.Y.: Books for Libraries Press, 1970.

MLA (9th ed.) Citation

Acker, Helen. Four Sons of Norway. Books for Libraries Press, 1970.

Warning: These citations may not always be 100% accurate.