Last updated at 2:43 pm UTC on 19 June 2020
Smalltalk-80: The Interactive Programming Environment; AdeleGoldberg, Addison-Wesley, 1984. ISBN 0-201-11372-4.
Available for free at http://sdmeta.gforge.inria.fr/FreeBooks/TheInteractiveProgrammingEnv/TheInteractiveProgrammingEnv.pdf
One of the three original primary references for Smalltalk, all usually referred to by color. See also: Blue Book and Green Book. Sometimes also called the "Orange Book" – depending on whether you see its cover as red-orange or orange-red.