- What is an imaginary number What is iwww.mathforum.org/dr.math/faq/faq.imag.num.html
- Scholarly discussion about imaginary numbers.www.math.toronto.edu/mathnet/answers/imaginary.html
- Discussion about complex numbers and the notation "i".www.math.toronto.edu/mathnet/questionCorner/complexorigin.html
- Scholarly explanation of imaginary numbers.www.friesian.com/imagine.htm