By far the best reference anyone can hope to find about ants is the following:
Holldobler, Bert and Wilson, E. O. (1990) The Ants. The Belknap Press of Harvard University Press, Cambridge, Massachusetts. This beautiful book costs approximately $75 but is the most thorough and readable book available. It is often referred to as "the ant bible".
Other books:
Beattie, Andrew (1995) The Evolutionary Ecology of Ant-Plant Mutualisms.
Doros, Arthur (1987) Ant Cities. Scholastic Inc., New York, New York.
Holldobler, Bert and Wilson, E. O. (1994) Journey to the Ants. The Belknap Press of Harvard University Press, Cambridge, Massachusetts.
Hutchins, Ross, E. (1967) The Ant Realm. Dodd, Mead and Company, New York.
Larson, Mervin and Peggy P. (1965) All About Ants. The world Publishing Co., Cleveland and NY.
Selsam, Millicent (1967) Questions and Answers about Ants. Uncle Milton Industries, Culver City, CA.
Shuttlesworth, Dorothy E. (1964) Story of Ants. Doubleday and Co. Inc., Garden City, NY.
Wilson, Edward O. (1994) The Right Stuff. Island Press/Shearwater Books, Washington, DC.
Magazine articles:
Brown, James H. et al. (1979) Granivory in Desert Ecosystems. Annual Review of Ecological Systems 10:201-227.
Chapela, Ignacio H. et al. (1994) Evolutionary History of the Symbiosis Between Fungus-Growing Ants and Their Fungi. Science 266:1691-1697.
Christ, Thomas O. and Friese, Carl F. (1994) The Use of Ant Nests by Subterranean Termites in Two Semiarid Ecosystems. American Midland Naturalist 131(2):370-373.
Gordon, Deborah M. (1993) The spatial scale of seed collection by harvester ants. Oecologia 95:479-487.
Holldobler, Bert (1971) Communication Between Ants and Their Guests. Scientific American 224(3):86-93.
Johnson, Robert A. (1996) Arizona Ants. Arizona Wildlife Views 39(6):2-5.
Knoch, Tom R. et al. (1993) Endophytic fungi alter foraging and dispersal by desert ants. Oecologia 95:470-473.
Topoff, Howard (1990) Slave-making Ants. American Scientist 78:520-528.