RussGus: 3 hits for Pethybridge, R.

The Bibliographic Database of German Publication on Russia, the Soviet Union and its Successor States (RussGus) contains about 170.000 records from 1974 to 2003 and collects publications of different document types: books, dissertations and other university publications, articles from journals and newspapers including reviews, maps etc. The lists of personal and geographical subjects are located here and here.

Your search for Pethybridge, R. provides 3 hits
1	Roger Pethybridge: The Social Prelude to Stalinism Scharff, Roland, in: Osteuropa, 1977, S. 262-263 (Rezension)
2	Pethybridge, Roger: One Step Backwards, Two Steps Forward. Soviet Society and Politics in the New Economic Policy. Baberowski, Jörg, in: Jahrbücher für Geschichte Osteuropas, 39, 1991, S. 611-614 (Rezension)
3	Roger Pethybridge: One Step Backwards, Two Steps Forward. Soviet Society and Politics under the New Economic Policy (Ein Schrit rückwärts, zwei Schritte vorwärts. Die sowjetische Gesellschaft und Politik während der Zeit der Neuen Ökonomischen Politik (NEP/NÖP).) Altrichter, Helmut, in: Historische Zeitschrift, 256, 1993, S. 228-230 (Rezension)

The Bibliographic Database of German Publication on Russia, the Soviet Union and its Successor States (RussGus)

Roger Pethybridge: The Social Prelude to Stalinism

Pethybridge, Roger: One Step Backwards, Two Steps Forward. Soviet Society and Politics in the New Economic Policy.

Roger Pethybridge: One Step Backwards, Two Steps Forward. Soviet Society and Politics under the New Economic Policy (Ein Schrit rückwärts, zwei Schritte vorwärts. Die sowjetische Gesellschaft und Politik während der Zeit der Neuen Ökonomischen Politik (NEP/NÖP).)