Level desing bibliography Resource

Hi there,

next year I going to started Level desing teaching lessons in the http://www.unir.net/, I have given class in the past but never specifically as level desing.

I am workin in the syllabus right now and I want to add all bibliography possible about level desing.

can you help me? Thanks.

Modular Level Design
Free Pdf
http://udn.epicgames.com/Three/rsrc/Three/ModularLevelDesign/ModularLevelDesign.pdf

**the-hows and whys of level design **
Book
http://www.hourences.com/product/the-hows-and-whys-of-level-design-2/