APA
U.S. Department of the Interior, . (1971). The San Fernando, California, earthquake of february 9, 1971. Washington: United States Government Printing.
Chicago
U.S. Department of the Interior, . 1971. The San Fernando, California, earthquake of february 9, 1971. Washington: United States Government Printing.
Harvard
U.S. Department of the Interior, . (1971). The San Fernando, California, earthquake of february 9, 1971. Washington: United States Government Printing.
MLA
U.S. Department of the Interior, . The San Fernando, California, earthquake of february 9, 1971. Washington: United States Government Printing. 1971.