Multiple Category Memberships in Markets: An Integrative Theory and Two Empirical Tests Greta Hsu, Orhan Koçak, Michael T. Hannan • 2009
Growing Church Organizations in Diverse U.S. Communities, 1890–1926 Orhan Koçak, Glenn R. Carroll • 2008
Images of buried graves in Bayat, Afyon (Turkey) from high-resolution magnetic data and their comparison with preliminary excavations Funda Bilim, Aydın Büyüksaraç, Orhan Koçak • 2007