Listed here are resources specifically useful for research or projects focusing on intercultural communication, which includes global, cultural, diversity, multi-cultural, cross-cultural communications both within nations or states as well as cross-border communications. College of the Redwoods offers the course COMM-8 Intercultural Communication.
Worldmark encyclopedia of cultures and daily life
The Sage encyclopedia of intercultural competence by 
Intercultural Communication by 
Non-Western Perspectives on Human Communication by 
Global Business Etiquette by 
The Global Intercultural Communication Reader by 
International encyclopedia of marriage and family by 
Encyclopedia of Marriage and the Family by Library reference sources provide general background information and are helpful for gaining an overview and broad understanding of a topic, and to see how a broad topic or subject is organized, by sub-topics, by priority, or by chronology.