Cita APA

Helfert, E. A. (1972). Techniques of. Dow Jones - Irwin.

Chicago Edition Citation

Helfert, Enrich A. Techniques of. Illinios: Dow Jones - Irwin, 1972.

Cita MLA

Helfert, Enrich A. Techniques of. Dow Jones - Irwin, 1972.