Impact of Optimal Cropping Patterns on Incomes in a Punjab District. The Pakistan Development Review, [S. l.], v. 15, n. 2, p. pp.218–221, 1976. DOI: 10.30541/v15i2pp.218-221. Disponível em: https://www.thepdr.pk/index.php/pdr/article/view/418. Acesso em: 7 dec. 2025.