Tolong jelaskan mengenai Tulisan karya Sparkman dari John Sparkman

Sparkman, John. "Checks and balances in American foreign policy." Ind. LJ 52 (1976): 433. online

Sparkman, John. "The Problems of Multi-State Taxation of Interstate Commerce Income." American Bar Association Journal (1960): 375-378.

Sparkman, John. "Multinational Corporation and Foreign Investment, The." Mercer L. Rev. 27 (1975): 381.