APA (7th ed.) Citation

United States. National Weather Service. (1998). General-storm PMP index map: California : HMR 58/HMR 59. [The National Weather Service?].

Chicago Style (17th ed.) Citation

United States. National Weather Service. General-storm PMP Index Map: California : HMR 58/HMR 59. [Silver Spring, Md.]: [The National Weather Service?], 1998.

MLA (9th ed.) Citation

United States. National Weather Service. General-storm PMP Index Map: California : HMR 58/HMR 59. [The National Weather Service?], 1998.