Abdo, B., Aboubakr, W. (2019). Impact of marketing costs and the research and development on the profitability of Egypt's pharmaceutical companies. test, 1(العدد الثانى), 40-69. doi: 10.21608/sjar.2019.110146
Bassant Badr Eldin Abdo Abdo; Walid Aboubakr Aboubakr. "Impact of marketing costs and the research and development on the profitability of Egypt's pharmaceutical companies". test, 1, العدد الثانى, 2019, 40-69. doi: 10.21608/sjar.2019.110146
Abdo, B., Aboubakr, W. (2019). 'Impact of marketing costs and the research and development on the profitability of Egypt's pharmaceutical companies', test, 1(العدد الثانى), pp. 40-69. doi: 10.21608/sjar.2019.110146
Abdo, B., Aboubakr, W. Impact of marketing costs and the research and development on the profitability of Egypt's pharmaceutical companies. test, 2019; 1(العدد الثانى): 40-69. doi: 10.21608/sjar.2019.110146