@misc{report+of+board+of+engineer+officers+as+to+maximum+span+practicable+for+suspension+bridges,
    author = {Raymond, Charles W. i Bixby, William Herbert i Burr, Edward},
    title = {Report of Board of Engineer Officers as to maximum span practicable for suspension bridges},
    address = {Washington},
    publisher = {Government Printing Office},
    date = {1894}
}