First, do some quick research on your group. Google them! If there is a Wiki entry - great - get some basic information:
These books often have chapters on culture groups that include information on kinship, marriage, etc.
The first two in the list (**) are the best for cultures that exist today.
Existing Cultures
Existing and Historical Cultures
Historical Cultures
Use the search box on the Library's home page OR Google Scholar (via the link on the library databases page so you can connect to UNM resources) to search for your culture group's name. Also try searching the culture group's name with the words:
OR add a more specific term related to something you want to know about the group, e.g. marriage.