Eko, E. E. (1999). Effective writing. Heinemann Educational Books.
Chicagoスタイル(17版)引用形式Eko, Ebele E. Effective Writing. Heinemann Educational Books, 1999.
MLA(9版)引用形式Eko, Ebele E. Effective Writing. Heinemann Educational Books, 1999.
警告: この引用は必ずしも正確ではありません.