Helfert, E. (1987). Techniques of financial analysis (6th.). Universal Book Stall.
Chicago Style aipamenaHelfert, Erich. Techniques of Financial Analysis. 6th. New Delhi: Universal Book Stall, 1987.
MLA aipamenaHelfert, Erich. Techniques of Financial Analysis. 6th. Universal Book Stall, 1987.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.