The ISBN of The Simple Solution to Rubik's Cube is 0-553-14017-5.
The ISBN of Cube Route is 0-7653-4309-6.
The ISBN of The Ultimate Solution is 9780446751544.
The ISBN of As Simple as Snow is 0399152318.
The ISBN of The Mirror of Simple Souls is 0809134276.
The ISBN of The Capture - Animorphs - is 0-590-62982-4.
The ISBN of How Doth the Simple Spelling Bee is 9781103904297.
The ISBN of The Simple Art of Murder is 0-394-75765-3.
To convert an ISBN to a DOI, you need to use a crossref.org tool called "Simple Text Query." This tool allows you to input the ISBN and retrieve the corresponding DOI.
The ISBN of The Summoned is 0-7434-0700-8.
The ISBN of Concrete Mathematics is 0201558025.
The ISBN of The Excalibur Alternative is 0671318608.
The ISBN of Glorifying Terrorism is 0955468809.