From the NHBS purchase page, this reference,

"Lists all 41 families, 371 genera, and 4408 species of the insect order Psocoptera (psocids) described up to the end of the year 2000. Graphically analyses the chronological discovery of species diversity. A synoptic table presents classification down to genus level with numbers of known species per taxon for each main biogeographical region of the world. Unusually also cites almost all other known references pertaining to their geographical distribution, morphology, biology, ecology, etc. Proposes several new names, synonymies, combinations, and status designations."

Lienhard compiled genera data from this reference in Classification of Psocoptera with checklist of genera (including Cenozoic and Cretaceous fossils, in amber). Though unpublished and removed from its original website, it is still available (as linked) on the WayBackMachine.

Lienhard also published Additions and corrections in Psocid News, No. 4 (Feb. 17, 2003). It is freely available, as linked.