@book{Dobzhansky, author = {Dobzhansky, T.}, title = {The biological basis of human freedom, New York and London (Columbia University Press) 1969.}, language = {en} } @book{Dobzhansky, author = {Dobzhansky, T.}, title = {The biology of ultimate concern, New York (The New American Library) 1967.}, language = {en} }