@misc{our+waterways+a+history+of+inland+navigation+considered+as+a+branch+of+water+conservancy,
    author = {Forbes, Urquhart A. i Ashford, W. H. R.},
    title = {Our waterways : a history of inland navigation considered as a branch of water conservancy},
    address = {London},
    publisher = {John Murray},
    date = {1906}
}