//-->
Eastern Europe : a geography of the Comecon countries
Mellor, Roy E. H., (1975)
Socialističeskaja ėkonomičeskaja integracija kak ėkonomikogeografičeskaja problema
Alampiev, Petr Martynovič, (1971)
Socialist economic integration as an economic-geographic problem
Alampiev, P. M., (1972)