Lua APA (7ú heag.)

International Protea Research Symposium San Diego, Calif, International Society for Horticultural Science. Protea Working Group, International Society for Horticultural Science. Section for Ornamental Plants, Criley, R. A., & Parvin, P. E. (1990). Second International Protea Research Symposium: San Diego, California, U.S.A., March 7-8, 1989. International Society for Horticultural Science.

Lua i Stíl Chicago (17ú heag.)

International Protea Research Symposium San Diego, Calif, International Society for Horticultural Science. Protea Working Group, International Society for Horticultural Science. Section for Ornamental Plants, Richard A. Criley, agus Philip Eugene Parvin. Second International Protea Research Symposium: San Diego, California, U.S.A., March 7-8, 1989. Wageningen, Netherlands: International Society for Horticultural Science, 1990.

Lua MLA (8ú heag.)

International Protea Research Symposium San Diego, Calif, et al. Second International Protea Research Symposium: San Diego, California, U.S.A., March 7-8, 1989. International Society for Horticultural Science, 1990.

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