Roysdon, C. (1983). Directory of Library Instruction Materials in Pennsylvania Libraries.
Citazione stile Chigago Style (17a edizione)Roysdon, Christine. Directory of Library Instruction Materials in Pennsylvania Libraries. 1983.
Citatione MLA (9a ed.)Roysdon, Christine. Directory of Library Instruction Materials in Pennsylvania Libraries. 1983.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.