(1973). Directory of Pennsylvania Library Resources: A Guide to the Resources and Services of Academic, Special, and Large Public Libraries.
Citazione stile Chigago Style (17a edizione)Directory of Pennsylvania Library Resources: A Guide to the Resources and Services of Academic, Special, and Large Public Libraries. 1973.
Citatione MLA (9a ed.)Directory of Pennsylvania Library Resources: A Guide to the Resources and Services of Academic, Special, and Large Public Libraries. 1973.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.