The difference between Intel/MASM syntax and AT&T/GNU syntax is rather superficial[1], so with a little squinting you can use a MASM book with the GNU assembler. Newer versions of the GNU assembler also come with a directive .intel_syntax so you can write your learning programs in MASM syntax.

[1]http://www.ibm.com/developerworks/linux/library/l-gas-nasm.h...