Muhammad, N. Z., Keyvanfar, A., Abd. Majid, M. Z., Shafaghat, A., Magana, A. M., & Dankaka, N. S. (2015). Causes of variation order in building and civil engineering projectsin Nigeria.

Muhammad, Nasiru Zakari, Ali Keyvanfar, Muhd. Zaimi Abd. Majid, Arezou Shafaghat, Aliyu Muhammad Magana, and Nafisa Sabiu Dankaka. Causes of Variation Order in Building and Civil Engineering Projectsin Nigeria. 2015.

Muhammad, Nasiru Zakari, et al. Causes of Variation Order in Building and Civil Engineering Projectsin Nigeria. 2015.