1. Andrews, G. C. (2019). Canadian Professional Engineering and Geoscience: Practice and Ethics (6th ed.). Nelson. Chapter 3, p. 68, states, "The professional's seal on a document indicates that he or she takes responsibility for it."
2. Association of Professional Engineers and Geoscientists of Saskatchewan (APEGS). (2020). Guideline for Use of Professional Seal. Section 2.1 states, "The seal is a mark of reliance and an indication that a professional member has accepted professional responsibility for the document."
3. Marston, D. L. (2016). Law for Professional Engineers, Canadian and Global Insights (5th ed.). McGraw-Hill Ryerson. Chapter 4, p. 78, discusses that the seal signifies that the professional takes responsibility for the design.