1. Marston, D. L. (2016). Law for Professional Engineers, Canadian and Global Insights (5th ed.). McGraw-Hill Ryerson. Chapter 10, pp. 218-219, describes the sole proprietorship as the "simplest form of business organization" with minimal legal formalities.
2. Samuels, B. M., & Sanders, D. R. (2015). Practical Law of Architecture, Engineering, and Geoscience (3rd Canadian ed.). Pearson Canada. Chapter 11, p. 218, notes the ease of formation and minimal regulation.
3. University of British Columbia, Sauder School of Business. (n.d.). Courseware on Business Structures. "Sole Proprietorships," notes the lack of formal legal process to create and the minimal regulatory burden.