@book{Kierkegaard, author = {Kierkegaard, S{\o}ren}, title = {Either / or. Volume one, New York (Anchor Books) 1959.}, language = {en} } @book{Kierkegaard, author = {Kierkegaard, S{\o}ren}, title = {Either / or. Volume two, New York (Anchor Books) 1959.}, language = {en} }