Source: https://www.researchgate.net/profile/Hayrettin-Ergun/publication/281846422_DIL_VE_SAYISAL_YETENEKLER_ILE_FIZIK_BASARISI_ARASINDAKI_ILISKI/links/55fb0ab408aeba1d9f3a0d54/DIL-VE-SAYISAL-YETENEKLER-ILE-FIZIK-BASARISI-ARASINDAKI-ILISKI.pdf