Fitting, H., Heinrich, S., Jost, L., & Karsten, G. (1921). Strasburgers text-book of botany (5th ed.). Macmillan.
Lua i Stíl Chicago (17ú heag.)Fitting, Hans, Schenck Heinrich, Ludwig Jost, agus George Karsten. Strasburgers Text-book of Botany. 5th ed. London: Macmillan, 1921.
Lua MLA (9ú heag.)Fitting, Hans, et al. Strasburgers Text-book of Botany. 5th ed. Macmillan, 1921.
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