1. ACI (American Concrete Institute). 2019. Building code requirements for structural concrete (with commentary). ACI CODE-318. Detroit: ACI.
2. Timber Construction Manual
3. ANSI (American National Standards Institute). 2017. Wood poles—Specifications and dimensions. ANSI O5.1-2017. New York: ANSI.
4. AREA (American Railway Engineering Association). 1921. Definitions, specifications, and principles of practice for railway engineering. Chicago: AREA.
5. ASCE. 2019. Wood pole structures for electrical transmission lines, MOP 141. Reston, VA: ASCE.