T. Paul Schultz. Economics o[ Population. Reading, Mass. (USA): Addison - Wesley Publishing Co. 1981. The Pakistan Development Review, [S. l.], v. 20, n. 2, p. pp.269–273, 2022. DOI: 10.30541/v20i2pp.269-273. Disponível em: https://thepdr.pk/index.php/pdr/article/view/567. Acesso em: 7 jun. 2025.