@misc{concrete+costs+tables+and+recommendations+for+estimating+the+time+and+cost+of+labor+operations+in+concrete+construction+and+for+introducing+economical+methods+of+management,
    author = {Taylor, Frederic Winslow i Thompson, Sanford E.},
    title = {Concrete Costs : tables and recommendations for estimating the time and cost of labor operations in concrete construction and for introducing economical methods of management},
    address = {New York i London},
    publisher = {Wiley i Chapman & Hall},
    date = {1912}
}