Anderson SE, Dallal GE, Must A (Nisan 2003). "Relative weight and race influence average age at menarche: results from two nationally representative surveys of US girls studied 25 years apart". Pediatrics. 111 (4 Pt 1). ss. 844-50. doi:10.1542/peds.111.4.844. PMID12671122.
Al-Sahab B, Ardern CI, Hamadeh MJ, Tamim H (2010). "Age at menarche in Canada: results from the National Longitudinal Survey of Children & Youth". BMC Public Health. Cilt 10. s. 736. doi:10.1186/1471-2458-10-736. PMC3001737 $2. PMID21110899.
Atay, Z.; Turan, S.; Guran, T.; Furman, A.; Bereket, A (13 Haziran 2011). "Puberty and Influencing Factors in Schoolgirls Living in Istanbul: End of the Secular Trend?". Pediatrics. 128 (1). ss. e40-5. doi:10.1542/peds.2010-2267. PMID21669888.
Anderson SE, Dallal GE, Must A (Nisan 2003). "Relative weight and race influence average age at menarche: results from two nationally representative surveys of US girls studied 25 years apart". Pediatrics. 111 (4 Pt 1). ss. 844-50. doi:10.1542/peds.111.4.844. PMID12671122.
Al-Sahab B, Ardern CI, Hamadeh MJ, Tamim H (2010). "Age at menarche in Canada: results from the National Longitudinal Survey of Children & Youth". BMC Public Health. Cilt 10. s. 736. doi:10.1186/1471-2458-10-736. PMC3001737 $2. PMID21110899.
Atay, Z.; Turan, S.; Guran, T.; Furman, A.; Bereket, A (13 Haziran 2011). "Puberty and Influencing Factors in Schoolgirls Living in Istanbul: End of the Secular Trend?". Pediatrics. 128 (1). ss. e40-5. doi:10.1542/peds.2010-2267. PMID21669888.