Langland, W., Salter, E., & Pearsall, D. (1967). Piers Plowman. Edward Arnold.
Lua i Stíl Chicago (17ú heag.)Langland, William, Elizabeth Salter, agus Derek Pearsall. Piers Plowman. London: Edward Arnold, 1967.
Lua MLA (8ú heag.)Langland, William, et al. Piers Plowman. Edward Arnold, 1967.
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