Cita APA (7th ed.)

Giet, A., Head, J. W., & Phippen, H. D. (1956). Abacs or nomograms. Iliffe.

Cita Chicago (17th ed.)

Giet, Armand, J. W. Head, i H D. Phippen. Abacs or Nomograms. Lond.: Iliffe, 1956.

Cita MLA (8th ed.)

Giet, Armand, et al. Abacs or Nomograms. Iliffe, 1956.