Không rõ. (2012). Internation Conference GMS 2020: Balancing Economic Growth and Environmental Sustainability. NOTNXB.
Citación estilo ChicagoKhông rõ. Internation Conference GMS 2020: Balancing Economic Growth and Environmental Sustainability. NOTNXB, 2012.
Cita MLAKhông rõ. Internation Conference GMS 2020: Balancing Economic Growth and Environmental Sustainability. NOTNXB, 2012.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.