Nahin, P. J. (1998). An imaginary tale: The story of [the square root of minus one]. Princeton University Press.

Nahin, Paul J. An Imaginary Tale: The Story of [the Square Root of Minus One]. Princeton, N.J.: Princeton University Press, 1998.

Nahin, Paul J. An Imaginary Tale: The Story of [the Square Root of Minus One]. Princeton University Press, 1998.