APA (7th ed.) Citation

Gaul, J. H. (1948). The Neolithic period in Bulgaria: Early food-producing cultures of Eastern Europe. s.n..

Chicago Style (17th ed.) Citation

Gaul, James Harvey. The Neolithic Period in Bulgaria: Early Food-producing Cultures of Eastern Europe. [Cambridge, Mass.: s.n., 1948.

MLA (8th ed.) Citation

Gaul, James Harvey. The Neolithic Period in Bulgaria: Early Food-producing Cultures of Eastern Europe. s.n., 1948.