Formal Specification in Metamorphic Programing. - David A. Penny; Richard C. Holt; Michael W. Godfrey (VDM Europe (1), 1991)

Multicolour programming and metamorphic programming: object oriented programming-in-the-large. - Richard C. Holt; David A. Penny; Spiros Mancoridis (CASCON, 1992)

A Conceptual Framework for Software Development. - Spiros Mancoridis; Richard C. Holt; David A. Penny (ACM Conference on Computer Science, 1993)

A "curriculum-cycle" environment for teaching programming. - Spiros Mancoridis; Richard C. Holt; David A. Penny (SIGCSE, 1993)

The software landscape: a visual formalism for programming-in-the-large. - David A. Penny (1993)

An Estimation-Based Management Framework for Enhancive Maintenance in Commercial Software Products. - David A. Penny (ICSM, 2002)

Release Planning. - David A. Penny (ICSM, 2002)