@misc{urban+concept+of+a+healthy+city+case+study+city+of+tripoli+libya+selected+aspects,
    author = {Amer, Eltaher A. K.},
    title = {Urban concept of a healthy city case study: city of Tripoli - Libya : (selected aspects)},
    publisher = {[s.n.]},
    date = {1993}
}