Schumacher, E. (1977). A Guide for the perplexed. Sphere books.
Chicago Style aipamenaSchumacher, E.F. A Guide for the Perplexed. London: Sphere books, 1977.
MLA aipamenaSchumacher, E.F. A Guide for the Perplexed. Sphere books, 1977.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.