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2. Higgins David A. (1986). Data Structured Software Maintenance: The Warnier/Orr Approach New York: Dorset House. Higgins David A. (1986). Data Structured Software Maintenance: The Warnier/Orr Approach New York: Dorset House.
3. Parikh Girish (1984). Programmer Productivity: Achieving an Urgent Priority Englewood Cliffs NJ: Prentice-Hall. Parikh Girish (1984). Programmer Productivity: Achieving an Urgent Priority Englewood Cliffs NJ: Prentice-Hall.
4. Parikh Girish (1985). There is a Fortune to be Made in Software Maintenance Chicago: Shetal Enterprises. Parikh Girish (1985). There is a Fortune to be Made in Software Maintenance Chicago: Shetal Enterprises.