@book {2426,
	title = {Knowledge: Its Creation, Distribution, and Economic Significance},
	volume = {II},
	year = {1984},
	publisher = {Princeton University Press},
	organization = {Princeton University Press},
	address = {Princeton},
	author = {Machlup, Fritz}
}
@book {2425,
	title = {Knowledge: Its Creation, Distribution, and Economic Significance},
	volume = {I},
	year = {1980},
	publisher = {Princeton University Press},
	organization = {Princeton University Press},
	address = {Princeton},
	author = {Machlup, Fritz}
}
@book {2424,
	title = {The Production and Distribution of Knowledge in the United States},
	year = {1962},
	publisher = {Princeton University Press},
	organization = {Princeton University Press},
	address = {Princeton},
	author = {Machlup, Fritz}
}
