National Guitar Academy, Kids Guitar Lessons: everything you need to get started on your guitar journey, https://nationalguitaracademy.com/kids-guitar-lessons/
OxfordOwl, Handwriting in Year 2, https://home.oxfordowl.co.uk/english/primary-handwriting/handwriting-year-2-age-6-7/
Pianist, What is the best age to start learning the piano? https://www.pianistmagazine.com/blogs/what-is-the-best-age-to-start-learning-the-piano/
PADI，Bubblemaker program, https://www.padi.com/courses/bubblemaker
PBS，What's the right age to begin music lessons, https://www.pbs.org/parents/thrive/whats-the-right-age-to-begin-music-lessons
PGA，Golf's American development model, https://www.pga.coach/Golf%27s_American_Development_Model.pdf
School of Rock, What is the best age to learn piano?https://www.schoolofrock.com/resources/keyboard/what-is-the-best-age-to-learn-piano
School of Rock, What is the best age to learn to play drums, https://www.schoolofrock.com/resources/drums/what-is-the-best-age-to-learn-to-play-drums
School of Rock, What is the best age to learn to play guitar, https://www.schoolofrock.com/resources/guitar/what-is-the-best-age-to-learn-to-play-guitar
Scuba Diving, Is your child ready to scuba dive? 5 questions to ask, https://www.scubadiving.com/is-your-child-ready-to-scuba-dive-5-questions-to-ask
Scratch Jr, Coding for young children, https://www.scratchjr.org/
The Aspen Institute, What is flag becomes the standard way of playing football until high school? https://assets.aspeninstitute.org/wp-content/uploads/2018/09/FINAL-Future-of-Football-Paper.3.pdf?_ga=2.152381241.1220528857.1614310255-343227159.1614051745
USAB，Youth Basketball Guidelines, https://www.usab.com/youth/development/youth-basketball-guidelines
USTA，USA Tennis Parents' Guide, http://assets.usta.com/assets/1/USTA_Import/USTA/dps/doc_437_2.pdf
USA Archery, Athlete development model, https://www.usarchery.org/resources/athlete-development-model-211020141337.pdf
Xenith, What is the right age to start tackle football, https://www.xenith.com/blogs/the-huddle/what-is-the-right-age-to-start-tackle-football
透彻的背景逻辑，让我受益匪浅。
独特的情感表达观点，值得收藏。
详细的情感表达逻辑，非常的引人入胜。
详细的立场结构，非常的实用。
详细的背景作者，非常的引人入胜。
有趣的思路写作，令人耳目一新。