Hughes, J. K. (1979). PL-I structured programming. John Wiley.
シカゴスタイル引用形Hughes, Joan Kirkby. PL-I Structured Programming. New York: John Wiley, 1979.
MLA引用形式Hughes, Joan Kirkby. PL-I Structured Programming. John Wiley, 1979.
警告: この引用は必ずしも正確ではありません.