G. Heel, P., J. Jessen, R., عبدالفتاح, . (1978). Basic Statistics For Business and Economics. test, 2(1), 83-87. doi: 10.21608/alat.1978.219749
Paul G. Heel; Raymond J. Jessen; عبداللطيف عبدالفتاح. "Basic Statistics For Business and Economics". test, 2, 1, 1978, 83-87. doi: 10.21608/alat.1978.219749
G. Heel, P., J. Jessen, R., عبدالفتاح, . (1978). 'Basic Statistics For Business and Economics', test, 2(1), pp. 83-87. doi: 10.21608/alat.1978.219749
G. Heel, P., J. Jessen, R., عبدالفتاح, . Basic Statistics For Business and Economics. test, 1978; 2(1): 83-87. doi: 10.21608/alat.1978.219749