REFERENCES
- C. Alperin, Heron's area formula, College Math. J. 18 (1987), 137–138.
- David E. Dobbs, Proving Heron's formula tangentially, College Math. J. 15 (1984), 252–253.
- William Dunham, An ancient/modern proof of Heron's formula, Mathematics Teacher 78 (1985), 258–259.