Murray, W., & Aitchison, M. (1972). Sunny days. Ladybird Books.
Lua i Stíl Chicago (17ú heag.)Murray, William, agus Martin Aitchison. Sunny Days. Loughborough [England]: Ladybird Books, 1972.
Lua MLA (9ú heag.)Murray, William, agus Martin Aitchison. Sunny Days. Ladybird Books, 1972.
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