Rock art near Rancho San Gregorio

Chicago citation style
Crosby, Harry W., 1926. Rock art near Rancho San Gregorio. April 1972. Retrieved from the Digital Public Library of America, https://library.ucsd.edu/dc/object/bb12640059. (Accessed December 14, 2018.)
APA citation style
Crosby, Harry W., 1926, (April 1972) Rock art near Rancho San Gregorio. Retrieved from the Digital Public Library of America, https://library.ucsd.edu/dc/object/bb12640059
MLA citation style
Crosby, Harry W., 1926. Retrieved from the Digital Public Library of America <https://library.ucsd.edu/dc/object/bb12640059>.
Note: These citations are programmatically generated and may be incomplete.