Howell, D., & Raison, T. (1961). Principles in practice: A series of Bow Group essays for the 1960s. Conservative Political Centre on behalf of the Bow Group.
Citazione stile Chigago Style (17a edizione)Howell, David, e Timothy Raison. Principles in Practice: A Series of Bow Group Essays for the 1960s. London: Conservative Political Centre on behalf of the Bow Group, 1961.
Citatione MLA (8a ed.)Howell, David, e Timothy Raison. Principles in Practice: A Series of Bow Group Essays for the 1960s. Conservative Political Centre on behalf of the Bow Group, 1961.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.