Statistical charts and indicators on the situation of youth, 1970-1990. Naciones Unidas.
Cita Chicago Style (17a ed.)Statistical Charts and Indicators on the Situation of Youth, 1970-1990. Nueva York: Naciones Unidas.
Cita MLA (9a ed.)Statistical Charts and Indicators on the Situation of Youth, 1970-1990. Naciones Unidas.
警告：这些引文格式不一定是100％准确.