Etextbooks collection

Since I want to work as lecturer, I am going to focus more on etextbooks that addresses college students.
Here are my five etextbooks that I suggest, which I took from The Orange Grove.

1. The first etextbook I suggest to be use is USA Elections in Brief

Intended class: Introduction to Politics.

Level: college student.
http://florida.theorangegrove.org/og/file/fc445611-932e-7999-4416-579da38b2550/1/USelections.pdf

2. The second etextbook I suggest to be use is Concepts in Calculus I

Intended class: Calculus.

Level: college student.

http://florida.theorangegrove.org/og/file/4482d4d4-66ec-ae46-4b2e-4bfa7925fd17/1/Bona_Low-Res_revised.pdf

3. The third etextbook I suggest to be use is Introduction to Computer Science II

Intended class: Introduction to Computer Science.

Level: college student.

http://www.saylor.org/courses/cs102/

4. The fourth etextbook I suggest to be use is Principles of Object-Oriented Programming.

Intended class: Programming Class.

Level: college student.

http://florida.theorangegrove.org/og/file/33bf62f3-8ad1-7dde-e23f-6f17aca953c7/1/OOProgramming.pdf

5. The fifth etextbook I suggest to be use is Introduction to Politics

Intended class: Introduction to Politics.

Level: college student.

http://www.saylor.org/courses/polsc101/