Cita APA (7th ed.)

Krefft, S. (1974). Safety in the air. Ciba-Geigy.

Cita Chicago (17th ed.)

Krefft, Siegfried. Safety in the Air. Basle: Ciba-Geigy, 1974.

Cita MLA (8th ed.)

Krefft, Siegfried. Safety in the Air. Ciba-Geigy, 1974.