@book{28228,
	author = {Spencer, Herbert,},
	title = {First principles /},
	publisher = {Williams & Norgate,},
	year = {1887.},
	series = {A system of synthetic philosophy.},
	address = {London :},
	edition = {5th ed.},
	note = {"Fifth edition. (Seventh thousand) Containing an Appendix."}
}