Fortin Morales, Alvaro M., Fons J. R. Van De Vijver, and Ype H. Poortinga. 2020. “Guatemalan Pupils’ Exposure to Spanish and Educational Achievement: A Study across Ethnic Groups and Socioeconomic Status in Urban and Rural Schools”. Psihologia Resurselor Umane 14 (2):136-51. https://hrp-journal.com/index.php/pru/article/view/79.