@book{Twain, author = {Twain, Mark}, title = {The Complete Works of Mark Twain, Vol. 4: The American Vlaimant, New York (Harper and Brothers) 1924.}, language = {en} } @book{Twain, author = {Twain, Mark}, title = {The Complete Works of Mark Twain, Vol. 7: Life on the Mississippi, New York (Harper and Brothers) 1924.}, language = {en} }