Images of systems and the systems image: presidential address to ISGSR, June 1987CHECKLAND, P. B.Journal of applied systems analysis. 1988, Vol 15, pp 37-42, issn 0308-9541Article

Soft systems methodology: an overviewCHECKLAND, P. B.Journal of applied systems analysis. 1988, Vol 15, pp 27-30, issn 0308-9541Article

Techniques in soft systems practice. III, Monitoring and control in conceptual models and in evaluation studiesCHECKLAND, P. B; FORBES, P; MARTIN, S et al.Journal of applied systems analysis. 1990, Vol 17, pp 29-37, issn 0308-9541Article

Towards a systems-based methodology for real-world problem solving in Systems behaviour, 2nd ed.CHECKLAND, P. B; BEISHON, J; PETERS, G et al.1976, pp 51-77, isbn 0-06-31057-X, isbn 0-06-31057-XBook