Gaya APA
WELBURN, T. (1986).
STRUCTURED COBOL FUNDAMENTALS AND STYLE (Second Edition).
Mountain View, California:
MAYFIELD PUBLISHING COMPANY.
Gaya MLA
WELBURN, TYLER.
"STRUCTURED COBOL FUNDAMENTALS AND STYLE".
Second Edition
Mountain View, California:
MAYFIELD PUBLISHING COMPANY,
1986.
Textbook.