Reference Label	Details
Steele 1978	W. V. Steele, J. Chem. Thermodyn. 10, 919-927 (1978) The Standard Enthalpies of Formation of a Series of C7 Bridged-Ring Hydrocarbons: Norbornane, Norbornene, Nortricyclene, Norbornadiene, and Quadricyclane
as quoted by Pedley 1986	as quoted by Pedley 1986