Donald R. Whitehead (1969). "Wind Pollination in the Angiosperms: Evolutionary and Environmental Considerations". Evolution. 23 (1): 28–35. doi:10.2307/2406479. JSTOR2406479. PMID28562955.
Grant, Verne (1950). "The Protection of the Ovules in Flowering Plants". Evolution. 4 (3): 179–201. doi:10.2307/2405331. JSTOR2405331.
Donald R. Whitehead (1969). "Wind Pollination in the Angiosperms: Evolutionary and Environmental Considerations". Evolution. 23 (1): 28–35. doi:10.2307/2406479. JSTOR2406479. PMID28562955.
Grant, Verne (1950). "The Protection of the Ovules in Flowering Plants". Evolution. 4 (3): 179–201. doi:10.2307/2405331. JSTOR2405331.
Donald R. Whitehead (1969). "Wind Pollination in the Angiosperms: Evolutionary and Environmental Considerations". Evolution. 23 (1): 28–35. doi:10.2307/2406479. JSTOR2406479. PMID28562955.