San Francisco : as it was, as it is, and how to see it
MLA
Purdy, Helen Throop, and John Bernhardt Swart. San Francisco: As it Was, As it Is, and How to See It. San Francisco: Paul Elder and Company, 1912
APA, 7th edition
Purdy, H. Throop, & Swart, J. Bernhardt. (1912). San Francisco: as it was, as it is, and how to see it. San Francisco: Paul Elder and Company
Chicago, 17th edition
Purdy, Helen Throop, and John Bernhardt Swart. San Francisco: as it was, as it is, and how to see it. San Francisco: Paul Elder and Company, 1912