Academic Search Complete is a database of academic journals, magazines, and other scholarly resources, covering a wide range of subjects across the humanities, sciences, and social sciences. It's a great starting point for research, especially with its inclusion of many open access publications.
JSTOR provides comprehensive access to peer-reviewed scholarly journals, books, and primary sources from various disciplines within the humanities and social sciences.
Pacific war encyclopedia
World War II in the Pacific : an encyclopedia
World War II in Europe : an encyclopedia
Encyclopedia of World War II : a political, social and military history