EDNOTE. In re Prefaces,  etc. the volume below is quite useful. There is a much less technical recent volume by a Brit whose name I can't quite dredge up.

The Thresholds of Textuality

by Gerard Genette,

Translated by Jane E. Lewin,

Foreword by Richard Macksey

Cambridge University Press

Due/Published May 1997, 410 pages, paper

ISBN 0521424062