Source: https://www.amazon.com/Love-Languages-Teenagers-Secret-Effectively/dp/080241284X/ref=pd_sim_14_4?_encoding=UTF8&pd_rd_i=080241284X&pd_rd_r=WMV9PGQP71JVX0DECJ32&pd_rd_w=aZugz&pd_rd_wg=2b1Bl&psc=1&refRID=WMV9PGQP71JVX0DECJ32