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- Roger, Martyn (1999). Annuals and biennials. Macmillan. p. 160. ISBN 0333748891.{{cite book}}: CS1 maint: multiple names: authors list (link) "Primula...3 KB (288 words) - 23:58, 10 June 2023
Martyn (1999). Annuals and Biennials. Macmillan. pp. 10, 11. ISBN 0-333-74889-1. Allan M. Armitage (2004) Armitage's Garden Annuals: A Color Encyclopedia...22 KB (2,710 words) - 03:39, 1 December 2023
