Gough, Robert Edward; Poling, E. Barclay (1996). Small Fruits in the Home Garden. Food Products Press. m/s. 253–254. Dicapai pada March 30, 2012.
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Naqvi, SAMH (2004). "Diseases of fruits and vegetables: diagnosis and management, Volume 2". New York; Dordrecht ; London: Kluwer Academic. m/s. 466. Dicapai pada March 30, 2012. ISBN1402026072 – "An alternative to field-grown transplants is the use of container-grown, or plug plants. Plug plants rooted in soil-less media offer the advantage of being grown under controlled environmental conditions that practically ensure that the..."