Engelmann, G., Shaw, H., Trelease, W., & Gray, A. (1887). The botanical works of the late George Engelmann: Collected for Henry Shaw. J. Wilson.
Lua i Stíl Chicago (17ú heag.)Engelmann, George, Henry Shaw, William Trelease, agus Asa Gray. The Botanical Works of the Late George Engelmann: Collected for Henry Shaw. Cambridge, Mass.: J. Wilson, 1887.
Lua MLA (8ú heag.)Engelmann, George, et al. The Botanical Works of the Late George Engelmann: Collected for Henry Shaw. J. Wilson, 1887.
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