_:vb7350801 "2013 April 4, Patti Wollman Summers, Ann DeSollar-Hale, Heather Ibrahim-Leathers, \u201CAnatomy of an App\u201D, in Toddlers on Technology: A Parents\u2019 Guide, Bloomington, Ind.: AuthorHouse, \u2192ISBN, page 23:"@en . _:vb7350801 "If an app is entertaining, and especially if it contains age-appropriate humor, that increases its appeal. You just need to keep the learning in a Digitod's [i.e., a digital toddler's] wheelhouse (for you non-baseball fans, that's his prime area of ability)."@en .