@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}
}
@article {378,
	title = {Catalogue of Life: World Ferns},
	year = {2013},
	url = {http://www.catalogueoflife.org/col/details/species/id/14221175},
	author = {Hassler, M.}
}
@article {272,
	title = {Marsilea crenta C. Presl},
	year = {2013},
	url = {http://rmbr.nus.edu.sg/dna/organisms/details/589}
}
@article {266,
	title = {Marsilea crenta C. Presl},
	year = {2013},
	url = {http://rbg-web2.rbge.org.uk/thaiferns/factsheets/index.php?q=Marsilea_crenata.xml},
	author = {Stuart Lindsay and David Middleton}
}
@article {159,
	title = {Marsilea crenata },
	year = {2013},
	url = {http://www.iucnredlist.org/details/168620/0},
	author = {Zhuang, X}
}
