Machine learning with HTML/CSS by tutorials 
FriendZoned apprentice guide
iOS App Architecture. I know it. Or even better, “How to make a pokemon go app in iOS” … hehe
"iOS custom layouts + core graphics " to know all the ways of customize viewcontroller transitions, tableviews, collectionviews and make graphics to get unique applications out of the iOS standards scope.
Android 7 By Tutorials
the nature of code for swift
Ukulele Songbook for IOS Developers :]
Advanced iOS Games by Tutorials
Maybe because I am waiting for it: macOS Apprentice
C# with Unity by Tutorials 
I hope it might be how to implement Augmented Reality in your apps using SceneKit or SpriteKit and Swift
Virtual Reality Game Programming
OR
Virtual Reality Game Programming while in Virtual Reality
although the Unity Games by Tutorials that doesn’t link to anything in “Our Books” might be a good guess lol.
20 Ways to Avoid Killing Yourself in the Transition from iOS to Unity Programmer
My previous post was the joke
Now for my serious guess, Android by tutorials
I can see the android logo’s head on the left side of the image
I’ve got it! C# for beginners
I think that this book is Algorithm by tutorials or Unity by tutorials.
RW,
No doubt about it “Unity Games by Tutorials” (with all the other Unity content already out, I’m certain a book about it is about to come).
And a funny(ish) suggestion… “Tutorials by Tutorials”, where you show how to make your own tutorials. 
Better yet… “dOS by Tutorials: Enter the Age of the Command Line.”
Design Patterns in Swift!
Unity Games by Tutorials