Stewart, V. (2006). Improving poor performance detection causes & remedies. Infinity Books.
Chicago-viite (17. p.)Stewart, Valerie. Improving Poor Performance Detection Causes & Remedies. New Delhi: Infinity Books, 2006.
MLA-viite (9. p.)Stewart, Valerie. Improving Poor Performance Detection Causes & Remedies. Infinity Books, 2006.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.