Langdon, Steve J. (2002) The Native People of Alaska. Yupiit, p.52. Find the book on Amazon.

            In this book you will find the Unangan/Aleut, Sugpiaq/Alutiiq, Yupiit, Inupiat, Athabaskans and Tlingit and Haida regions.Then in you will find that he explains the history, population, technologies, diet, beliefs, trade, warfare, ceremonies, first contact with Europeans and how that effected the way of their life as its sub-points of each group.