Ranasinghe, P. C. H., & Diandas, J. (1988). Private bus transport in Sri Lanka: It's performance, productivity and manpower. Colombo: Friedrich-Ebert-Stiftung.
Παραπομπή Chicago StyleRanasinghe, P C H., and J. Diandas. Private Bus Transport in Sri Lanka: It's Performance, Productivity and Manpower. Colombo: Friedrich-Ebert-Stiftung, 1988.
Παραπομπή MLARanasinghe, P C H., and J. Diandas. Private Bus Transport in Sri Lanka: It's Performance, Productivity and Manpower. Colombo: Friedrich-Ebert-Stiftung, 1988.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.