Cita APA

Ervin, S. H., & Ervin, S. H. (1941). Arithmetic for business use (revised and enlarged.). Baltimore, Md.: HM Rowe.

Citación estilo Chicago

Ervin, S. H., y S. H. Ervin. Arithmetic for Business Use. revised and enlarged. Baltimore, Md.: HM Rowe, 1941.

Cita MLA

Ervin, S. H., y S. H. Ervin. Arithmetic for Business Use. revised and enlarged. Baltimore, Md.: HM Rowe, 1941.