A Primer on International Trade by Jan Pen. Random House, New York, 1967. The Pakistan Development Review, [S. l.], v. 10, n. 4, p. pp.503–505, 1970. DOI: 10.30541/v10i4pp.503-505. Disponível em: https://thepdr.pk/index.php/pdr/article/view/296. Acesso em: 26 oct. 2025.