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  1. ^ Kail, RV; Cavanaugh JC (2010). Human Development: A Lifespan View (5th ed.). Cengage Learning. p. 296. ISBN   978-0-495-60037-4 .
  2. ^ ? ? Schuiling (2016). Women's Gynecologic Health . Jones & Bartlett Learning. p. 22. ISBN   978-1-284-12501-6 . The changes that occur during puberty usually happen in an ordered sequence, beginning with thelarche (breast development) at around age 10 or 11, followed by adrenarche (growth of pubic hair due to androgen stimulation), peak height velocity, and finally menarche (the onset of menses), which usually occurs around age 12 or 13.
  3. ^ D. C. Phillips (2014). Encyclopedia of Educational Theory and Philosophy . Sage Publications. pp. 18?19. ISBN   978-1-4833-6475-9 . On average, the onset of puberty is about 18 months earlier for girls (usually starting around the age of 10 or 11 and lasting until they are 15 to 17) than for boys (who usually begin puberty at about the age of 11 to 12 and complete it by the age of 16 to 17, on average).
  4. ^ (Jorgensen & Keiding 1991).