Toys and Children: Aggressive toys and play. National Toy Council.
Chicago-viite (17. p.)Toys and Children: Aggressive Toys and Play. London: National Toy Council.
MLA-viite (8. p.)Toys and Children: Aggressive Toys and Play. National Toy Council.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.