Geological Survey (U.S.)\nNational Earthquake Information Center. (1967). Earthquake Information Bulletin. National Earthquake Information Center.
Citação do estilo Chicago (17ª ed.)Geological Survey (U.S.)\nNational Earthquake Information Center. Earthquake Information Bulletin. Rockville, Md: National Earthquake Information Center, 1967.
Citação MLA (8ª ed.)Geological Survey (U.S.)\nNational Earthquake Information Center. Earthquake Information Bulletin. National Earthquake Information Center, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.