Freddi, W.E. da S. 1979. A comparative study of the sexual knowledge of 15 to 17 year age high school students of Greater São Paulo: previous note. Revista da Escola de Enfermagem da USP. 13, 3 (Dec. 1979), 301–301. DOI:https://doi.org/10.1590/0080-6234197901300300301.