Cita APA

Poppe, B. B. (1980). Directory of world seismograph stations. Boulder, Colo.: World Data Center a for Solid Earth Geophysics U S Dept of Commerce.

Citación estilo Chicago

Poppe, Barbara B. Directory of World Seismograph Stations. Boulder, Colo.: World Data Center a for Solid Earth Geophysics U S Dept of Commerce, 1980.

Cita MLA

Poppe, Barbara B. Directory of World Seismograph Stations. Boulder, Colo.: World Data Center a for Solid Earth Geophysics U S Dept of Commerce, 1980.