ETUKUDO, Udobia Elijah; NWOKOCHA, Azubuike C. An Integral Approach for Computation of Cost-Benefit and Returns to Investment in Education. Journal of Educational and Social Research, London, U.K., v. 1, n. 2, p. 57, 2011. Disponível em: https://www.richtmann.org/journal/index.php/jesr/article/view/11715.. Acesso em: 10 mar. 2026.