@book{a+text+book+on+the+mechanics+of+materials+and+of+beams+columns+and+shafts,
    author = {Merriman, Mansfield},
    title = {A text-book on the mechanics of materials and of beams, columns, and shafts},
    address = {New York i London},
    publisher = {John Wiley & Sons ; i Chapman & Hall},
    date = {1897}
}