Pennsylvania Libraries: Research & Practice | University Library System, University of Pittsburgh. Cambridge University Press.
Citazione stile Chigago Style (17a edizione)Pennsylvania Libraries: Research & Practice | University Library System, University of Pittsburgh. Cambridge University Press.
Citatione MLA (9a ed.)Pennsylvania Libraries: Research & Practice | University Library System, University of Pittsburgh. Cambridge University Press.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.