Παραπομπή σε μορφή APA (7η εκδ.)

omar, a. (1970). on the maintance of a system of machines by one repairman. the institute of national planning.

Παραπομπή σε μορφή Chicago (17η εκδ.)

omar, ahmed. On the Maintance of a System of Machines by One Repairman. cairo: the institute of national planning, 1970.

Παραπομπή σε μορφή MLA (9th εκδ.)

omar, ahmed. On the Maintance of a System of Machines by One Repairman. the institute of national planning, 1970.