@book{138049,
	author = {Arias Sánchez, Oscar},
	title = {Grupos de presión en Costa Rica},
	publisher = {Editorial Costa Rica},
	year = {1980.},
	address = {San José, Costa Rica},
	edition = {5a ed.},
	note = {Originally presented as the author's thesis (licenciatura en leyes), Universidad de Costa Rica, 1967.}
}