Asia : China-south coast : Chu Kiang or Canton River : Kapsing Mun to Boca Tigris (northern sheet)

Chicago citation style
United States Hydrographic Office. Asia : China-south coast : Chu Kiang or Canton River : Kapsing Mun to Boca Tigris (northern sheet). 1920-10-01. Retrieved from the Digital Public Library of America, https://library.ucsd.edu/dc/object/bb12639937. (Accessed December 12, 2018.)
APA citation style
United States Hydrographic Office, (1920-10-01) Asia : China-south coast : Chu Kiang or Canton River : Kapsing Mun to Boca Tigris (northern sheet). Retrieved from the Digital Public Library of America, https://library.ucsd.edu/dc/object/bb12639937
MLA citation style
United States Hydrographic Office. Retrieved from the Digital Public Library of America <https://library.ucsd.edu/dc/object/bb12639937>.
Note: These citations are programmatically generated and may be incomplete.