Cita APA (7a ed.)

Estats Units d'Amèrica. (1924). Cloud forms: According to the international system of classification. Weather bureau, U.S. department of agriculture.

Cita Chicago Style (17a ed.)

Estats Units d'Amèrica. Cloud Forms: According to the International System of Classification. Washington: Weather bureau, U.S. department of agriculture, 1924.

Cita MLA (9a ed.)

Estats Units d'Amèrica. Cloud Forms: According to the International System of Classification. Weather bureau, U.S. department of agriculture, 1924.