American Psychological Association 6th edition

BALLARD BW, BIERMANN AW, & SIGMON AH. (n.d.). AN EXPERIMENTAL STUDY OF NATURAL LANGUAGE PROGRAMMING.

ISO-690 (author-date, English)

BALLARD BW, BIERMANN AW and SIGMON AH, [no date]. AN EXPERIMENTAL STUDY OF NATURAL LANGUAGE PROGRAMMING. .

Modern Language Association 9th edition

BALLARD BW, BIERMANN AW, and SIGMON AH. AN EXPERIMENTAL STUDY OF NATURAL LANGUAGE PROGRAMMING.

Mohr Siebeck - Recht (Deutsch - Österreich)

BALLARD BW/BIERMANN AW/SIGMON AH: AN EXPERIMENTAL STUDY OF NATURAL LANGUAGE PROGRAMMING,

Emerald - Harvard

BALLARD BW, BIERMANN AW and SIGMON AH. (n.d.). “AN EXPERIMENTAL STUDY OF NATURAL LANGUAGE PROGRAMMING”.

Warning: These citations may not always be 100% accurate.