Abdurrahman Umar
发表
Asha Kanwar,
Abdurrahman Umar,
Balasubramanian Kodhandaraman,
2010
.
Abdurrahman Umar,
G. Tahir,
2000
.
K. Sanni,
Abdurrahman Umar,
D. Theobald,
2007
.
Asha Kanwar,
Abdurrahman Umar,
K Balasubramanian,
2010
.
Abdurrahman Umar,
A. Mohammed,
A. Sani,
2021,
Rajagiri Management Journal.
Abdurrahman Umar,
2006
.
Patrick Alan Danaher,
Abdurrahman Umar,
P. Danaher,
2010
.
John Daniel,
Frances Ferreira,
John Lesperance,
2009
.
Patrick Alan Danaher,
Abdurrahman Umar,
P. Danaher,
2010
.