AppBarLayout on developer.android.com
Layout Lessons! Better Android Layouts: coordinator layout, constraint layout, percent relative layout. (https://withintent.uncorkedstudios.com/layout-lessons-better-android-layouts-b00f52b0643a)
Hello Toolbar, Goodbye ActionBar
Collapsing Toolbar Layout on antonioleiva.com
Coordinator Layout on habr pdf
CollapsingToolbarLayout with darker imageview (pdf)
Scrolling down triggers refresh instead of revealing the toolbar on stackoverflow.com
Handling Scrolls with CoordinatorLayout
Rambler about CoordinatorLayout
https://medium.com/@zoha131/coordinatorlayout-basic-8040c74cf426