Ross, C. S. (1991). Readers' Advisory Service: New Directions.
Citazione stile Chigago Style (17a edizione)Ross, Catherine Sheldrick. Readers' Advisory Service: New Directions. 1991.
Citatione MLA (9a ed.)Ross, Catherine Sheldrick. Readers' Advisory Service: New Directions. 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.