Cita APA (7th ed.)

Helmericks, C., & Helmericks, H. (1947). We live in the Arctic. Little, Brown.

Cita Chicago (17th ed.)

Helmericks, Constance, i Harmon Helmericks. We Live in the Arctic. Boston: Little, Brown, 1947.

Cita MLA (9th ed.)

Helmericks, Constance, i Harmon Helmericks. We Live in the Arctic. Little, Brown, 1947.