*Coombs, S. & A.N. Popper.  1982b.  Structure and function of the auditory system in the clown knifefish, Notopterus chitala.  Journal of Experimental Biology 97: 225-239.

*Crawford, J.D. & X. Huang.  1999.  Communication signals and sound production mechanisms of mormyrid electric fish.  Journal of Experimental Biology 202: 1417-1426.

*Howlett, R.  1996.  Root Cause of fish buoyancy.  Nature 380: 303.

*Jones, F.R.H.  1957.  The Physiology of Fishes, Vol. II, Behavior.  Academic Press Inc., Publishers, New York, New York.

*Marshall, N.B. 1966.  The Life of Fishes.  The World Publishing Company, New York, New York.

*Pough, F.H., C.M. Janis, & J.B. Heiser.  1999.  Dominating Life in Water.  Pp. 211-56.  In Teresa Ryu, (Ed.). Vertebrate Life, 5th ed.  Prentice Hall, Upper Saddle River, New Jersey.

*Schaefer, K.M. & C.W. Oliver.  1998 November.  Shape, Volume, and Resonance Frequency of the Swimbladder of Yellowfin Tuna (Thunnus albacares).  <http://swfsc.nmfs.noaa.gov/mmd/dsweb/lj-98-09c/lj-98-09c.htm>.  Accessed 2000 Oct 6.

*Schellart, N.A.M. & A. N. Popper.  1992.  Functional aspects of the evolution of the auditory system of actinopterygian fish. Pp.  295-30 In D.B. Webster, R.R. Fay, & A. N. Popper, (Eds.).  The Evolutionary Biology of Hearing, Springer-Verlag, New York, New York.

*Schmidt-Nielson, K.  1997.  Movement, Muscle, Biomechanics.  Pp. 395-463 In Animal Physiology: adaptation and environment, 5th ed.  Cambridge University Press, UK.

*Webb, J. F.  1998.  Laterophysic Connection: A unique Link Between the Swimbladder and the Lateral Line System in Chaetodon (Perciformes: Chaetodontidae). Copeia 4: 1032-1036.