EHRBAR AL. (1998). EVA: THE REAL KEY TO CREATING WEALTH. JOHN WILEY AND SONS.
Chicago-viite (17. p.)EHRBAR AL. EVA: THE REAL KEY TO CREATING WEALTH. NEW YORK: JOHN WILEY AND SONS, 1998.
MLA-viite (9. p.)EHRBAR AL. EVA: THE REAL KEY TO CREATING WEALTH. JOHN WILEY AND SONS, 1998.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.