Tilley, R. (1977). Specialized Service Not a Privilege but a Necessity; The Imperatives of Bullock.
Citazione stile Chigago Style (17a edizione)Tilley, Ruth. Specialized Service Not a Privilege but a Necessity; The Imperatives of Bullock. 1977.
Citatione MLA (9a ed.)Tilley, Ruth. Specialized Service Not a Privilege but a Necessity; The Imperatives of Bullock. 1977.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.