Cita APA (7a ed.)

Baldwin, R. T., & Langel, R. (1993). Tables and Maps of the DGRF 1985 and IGRF 1990. ISGI Publications Office.

Cita Chicago Style (17a ed.)

Baldwin, R. T., y R. Langel. Tables and Maps of the DGRF 1985 and IGRF 1990. Sant Maur des Fosses: ISGI Publications Office, 1993.

Cita MLA (9a ed.)

Baldwin, R. T., y R. Langel. Tables and Maps of the DGRF 1985 and IGRF 1990. ISGI Publications Office, 1993.