@book{77214,
	author = {Spencer, Herbrt and Cazelles, M. E.},
	title = {Principes De Biologie , },
	publisher = {Félix Alcan, Éditeur,},
	year = {1910.},
	address = {Paris : },
	edition = {Sixième Édition.},
	url = {https://fll.law.cu.edu.eg/fulltext/bks/B10-00000.pdf}
}