A book to read: “Culture’s Consequences: Comparing Values, Behaviors, Institutions and Organizations Across Nations” (Amazon link) by Geert Hofstede is one of the basic books regarding intercultural understanding. Based on a study in the 60s / 70s, Hofstede has layed down a principle categorization for differences in cultures.
This theory had not only been featured in Intercultural Management courses all over the world, but also holds valueable tips for managers and tourists alike in store.
More about Geert Hofstede on his website.
A good paper on Hofstede’s theory (pdf link, German only) had been written by Annett Reimer.