To my knowledge, there are no 画像 of the book covers yet, but I have just found out about some movie tie-in 本 for Barbie: 星, つ星 Light Adventure and Barbie & Her Sisters in a 子犬 Chase. Look out for them later in the year, when there will be book covers, and perhaps some content previews and plot information!
Star Light Adventure
Barbie Summer 2016 Movie Pictureback - Jul 26, 2016 | 16 Pages
"Children ages 3 to 7 will 愛 this full-color storybook based on the latest Barbie™ movie, releasing in fall 2016. Press-out paper ドール and over 50 stickers are included to add to the fun!"...
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