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Hoare, C. A. R., "Notes on Data Structuring," in Structured Programming (see 1).

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Wirth, N., "The Programming Language PASCAL," Acta Informatica, Vol. 1, No. 1, pp. 35--63.

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Zahn, C. T., "A Control Statement for Natural Top-down Structured Programming," presented at Symposium on Programming Languages, Paris, 1974, Springer-Verlag.

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Donald E. Knuth, Structured Programming with go to Statements, ACM Computing Surveys (CSUR), v.6 n.4, p.261-301, Dec. 1974  [doi>10.1145/356635.356640]

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Hoare, C. A. R. and N. Wirth, "An Axiomatic Definition of the Programming Language PASCAL," Acta Informatica, 1973, pp. 335--355.

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Hardgrave, W. T., Positional versus Keyword Parameter Communication in Programming Languages, Report of the Institute for Computer Applications in Science and Engineering (ICASE), NASA Langley Research Center, Hampton, Virginia, September 1974.

11

Dahl, O. J., "Hierarchical Program Structures," in Structured Programming (see 1).

12

Donald E. Knuth, The art of computer programming, volume 1 (3rd ed.): fundamental algorithms, Addison Wesley Longman Publishing Co., Inc., Redwood City, CA, 1997

Uwe F. Pleban, The use of transition matrices in a recursive-descent compiler, ACM SIGPLAN Notices, v.14 n.8, p.144-151, August 1979

Ronnie G. Ward, A non-iterative situation case statement, ACM SIGPLAN Notices, v.11 n.7, July 1976