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Joseph-Louis, Comte Lagrange, from Oeuvres Tome 6, "Essai sur le Problème des Trois Corps"—Essai (PDF) ; source Tome 6 (Viewer)

"Essay on the Three-Body Problem" by J-L Lagrange, translated from the above, in http://www.merlyn.demon.co.uk/essai-3c.htm .

Considerationes de motu corporum coelestium—Leonhard Euler—transcription and translation at http://www.merlyn.demon.co.uk/euler304.htm .

What are Lagrange points?—European Space Agency page, with good animations

Explanation of Lagrange points —Prof. Neil J. Cornish

A NASA explanation—also attributed to Neil J. Cornish

Explanation of Lagrange points—Prof. John Baez

Geometry and calculations of Lagrange points —Dr J R Stockton

Locations of Lagrange points, with approximations—Dr. David Peter Stern

An online calculator to compute the precise positions of the 5 Lagrange points for any 2-body system—Tony Dunn

Astronomy cast—Ep. 76: Lagrange Points Fraser Cain and Dr. Pamela Gay

The Five Points of Lagrange  by Neil deGrasse Tyson

Earth, a lone Trojan discovered