Straub, R. O. (2009). Telecourse student guide to accompany child development stepping stones (Third edition.). Worth Publishers ; Coast Learning Systems.
Chicago-viite (17. p.)Straub, Richard O. Telecourse Student Guide to Accompany Child Development Stepping Stones. Third edition. Fountain Calley, California: Worth Publishers ; Coast Learning Systems, 2009.
MLA-viite (9. p.)Straub, Richard O. Telecourse Student Guide to Accompany Child Development Stepping Stones. Third edition. Worth Publishers ; Coast Learning Systems, 2009.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.