Colombari, L., V. Imaizumi, L. Baldini, P. Nunes Chaves, e R. Goto. WINTER COVER CROPS SOWING SYSTEMS FOR PLANTING LETTUCE. Colloquium Agrariae. ISSN: 1809-8215, Vol. 14, nÂș 3, Jan. 2019, p. 169-78, http://revistas.unoeste.br/index.php/ca/article/view/2045.