Lipton, M., Smith, J. G., & Burgess, T. (1968). Matters of principle: Labour's last chance. Harmondsworth: Penguin Books.
Lua i Stíl Chicago (17ú heag.)Lipton, Michael, John Grieve Smith, agus Tyrrell Burgess. Matters of Principle: Labour's Last Chance. Harmondsworth: Penguin Books, 1968.
Lua MLA (8ú heag.)Lipton, Michael, et al. Matters of Principle: Labour's Last Chance. Harmondsworth: Penguin Books, 1968.
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