APA način citiranja (7. izdanje)

ECKES GEORGE. (2003). SIX SIGMA FOR EVERYONE. JOHN WILEY & SONS, INC.

Čikaški stil citiranja (17. izdanje)

ECKES GEORGE. SIX SIGMA FOR EVERYONE. NEW JERSEY: JOHN WILEY & SONS, INC, 2003.

MLA način citiranja (9. izdanje)

ECKES GEORGE. SIX SIGMA FOR EVERYONE. JOHN WILEY & SONS, INC, 2003.