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Lua i Stíl Chicago (17ú heag.)Viding, E., F. Spinath, T. Price, D. Bishop, P. Dale, agus R. Plomin. Genetic and Environmental Influence on Language Impairment in 4-year-old Same-sex and Opposite-sex Twins. 2004.
Lua MLA (9ú heag.)Viding, E., et al. Genetic and Environmental Influence on Language Impairment in 4-year-old Same-sex and Opposite-sex Twins. 2004.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.