APA-viite (7. p.)

Helfert, E. (1987). Techniques of financial analysis (6th.). Universal Book Stall.

Chicago-viite (17. p.)

Helfert, Erich. Techniques of Financial Analysis. 6th. New Delhi: Universal Book Stall, 1987.

MLA-viite (9. p.)

Helfert, Erich. Techniques of Financial Analysis. 6th. Universal Book Stall, 1987.