Cita APA (7a ed.)

Lauridsen, E. K. (1981). QD, a quartz declinometer of classic type. Danish Meteorological Institute.

Cita Chicago Style (17a ed.)

Lauridsen, E. Kring. QD, a Quartz Declinometer of Classic Type. Kobenhavn: Danish Meteorological Institute, 1981.

Cita MLA (9a ed.)

Lauridsen, E. Kring. QD, a Quartz Declinometer of Classic Type. Danish Meteorological Institute, 1981.