Wyndham, J. (1963). Trouble with lichen. Penguin.
Cita Chicago (17th ed.)Wyndham, John. Trouble with Lichen. Harmondsworth, Middlesex: Penguin, 1963.
Cita MLA (8th ed.)Wyndham, John. Trouble with Lichen. Penguin, 1963.
Atenció: Aquestes cites poden no estar 100% correctes.