BOECKELMAN, Keith. The American States in the Postindustrial Economy. State & Local Government Review. 1995, roč. 27, čís. 3, s. 182–187. Dostupné online [cit. 2019-11-26]. ISSN0160-323X.
BOECKELMAN, Keith. The American States in the Postindustrial Economy. State & Local Government Review. 1995, roč. 27, čís. 3, s. 182–187. Dostupné online [cit. 2019-11-26]. ISSN0160-323X.