APA Citation

Ballard, F., & Rivinus, M. W. M. (1966). Guide to the Wissahickon Valley. [Philadelphia?]: Friends of the Wissahickon.

Chicago Style Citation

Ballard, Frances., and Marion Willis Martin Rivinus. Guide to the Wissahickon Valley. [Philadelphia?]: Friends of the Wissahickon, 1966.

MLA Citation

Ballard, Frances., and Marion Willis Martin Rivinus. Guide to the Wissahickon Valley. [Philadelphia?]: Friends of the Wissahickon, 1966.

Warning: These citations may not always be 100% accurate.