Viding, E., Spinath, F., Price, T., Bishop, D., Dale, P., & Plomin, R. (2004). Genetic and environmental influence on language impairment in 4-year-old same-sex and opposite-sex twins.
Chicago-viite (17. p.)Viding, E., F. Spinath, T. Price, D. Bishop, P. Dale, ja R. Plomin. Genetic and Environmental Influence on Language Impairment in 4-year-old Same-sex and Opposite-sex Twins. 2004.
MLA-viite (9. p.)Viding, E., et al. Genetic and Environmental Influence on Language Impairment in 4-year-old Same-sex and Opposite-sex Twins. 2004.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.