@book {541,
	title = {Biology of Plants},
	series = {Biology of Plants},
	year = {2013},
	edition = {8th},
	author = {P. H. Raven and R. F. Evert and S. E. Eichhorn}
}
@inbook {448,
	title = {Biology of Plants},
	booktitle = {Biology of Plants},
	year = {2004},
	pages = {368-407},
	publisher = {W.H Freeman and Company Publishers},
	organization = {W.H Freeman and Company Publishers},
	chapter = {Seedless Vascular Plants},
	address = {USA},
	author = {Raven and Evert and Eichhorn}
}
