Soltis Andrew. Colle system: Zukertort variation, 5 b3: a White Opening you Can Use for the Rest of your Career

Chess Digest Ins., 1998. — 102 p. — ISBN: 0-87568-288-X.There are two faces to what we call the Colle System — but many authorities recognize only one. Weighty tomes like The Encyclopedia of Chess and The Oxford Companion to Chess, and even the Russian Chess — Encyclopedic Dictionary, define the Colle as an opening in which White puts pawns at d4, e3, and c3.Page 49 is missing.