T. D. A. Siqueira e R. S. de C. Vieira, “Demotivation and Leavin Early: a Study in a Population of Adolescent Female Swimming in Manaus”, RPI, vol. 5, nº 2, p. 121–125, dez. 2013, doi: 10.18256/2175-5027/psico-imed.v5n2p121-125.