APA
Helfert E. A., . (2003). Techniques of financial analysis. New York: The McGraw-Hill Companies.
Chicago
Helfert Erich A, . 2003. Techniques of financial analysis. New York: The McGraw-Hill Companies.
Harvard
Helfert E. A., . (2003). Techniques of financial analysis. New York: The McGraw-Hill Companies.
MLA
Helfert Erich A, . Techniques of financial analysis. New York: The McGraw-Hill Companies. 2003.