APA
Riker H., . (1979). Colorado Ghost Towns and Mining Camps: A Sketch Book. [Place of publication unknown]: The Filter Press.
Chicago
Riker Hugh, . 1979. Colorado Ghost Towns and Mining Camps: A Sketch Book. [Place of publication unknown]: The Filter Press.
Harvard
Riker H., . (1979). Colorado Ghost Towns and Mining Camps: A Sketch Book. [Place of publication unknown]: The Filter Press.
MLA
Riker Hugh, . Colorado Ghost Towns and Mining Camps: A Sketch Book. [Place of publication unknown]: The Filter Press. 1979.