Janzen, D. H. 1966. Coevolution of mutualism between ants and acacias in Central America. Evolution 20:249-275.

Janzen, D. H. 1967. Interaction of the bull's-horn acacia (Acacia cornigera L.) with an ant inhabitant (Pseudomyrmex ferruginea F. Smith) in eastern Mexico. University of Kansas Science Bulletin 47:315-558.

Janzen, D. H. 1969. Birds and the ant x acacia interaction in Central America, with notes on birds and other myrmecophytes. Condor 71:240-256.

Carroll, C. R.; Janzen, D. H. 1973. Ecology of foraging by ants. Annual Review of Ecology and Systematics 4:231-257.

Janzen, D. H. 1973a. Dissolution of mutualism between Cecropia and its Azteca ants. Biotropica 5:15-28.

Janzen, D. H. 1973b. Evolution of polygynous obligate acacia-ants in western Mexico. Journal of Animal Ecology 42:727-750.

Janzen, D. H. 1974. Swollen-thorn acacias of Central America. Smithsonian Contributions to Botany 13:1-131.

Janzen, D. H. 1975. Pseudomyrmex nigropilosa: a parasite of a mutualism. Science (Washington, D. C.) 188:936-937.

Janzen, D. H. (ed.) 1983. Costa Rican natural history. Chicago: University of Chicago Press, xi + 816 pp.

Janzen, D. H. 1983. Pseudomyrmex ferruginea (hormiga del cornizuelo, acacia-ant). Pp. 762-764 in: Janzen, D. H. (ed.) 1983. Costa Rican natural history. Chicago: University of Chicago Press, xi + 816 pp.

Smith, M. A.; Hallwachs, W.; Janzen, D. H. 2014. Diversity and phylogenetic community structure of ants along a Costa Rican elevational gradient. Ecography 37:720-731. PDF

Smith, M. A.; Janzen, D. H.; Hallwachs, W.; Longino, J. T. 2015. Observations of Adelomyrmex (Hymenoptera: Formicidae) reproductive biology facilitated by digital field microscopy and DNA barcoding. The Canadian Entomologist 6:611-616. 10.4039/tce.2014.82 PDF