Saarbafi & Mclean 2014, AESO Transformer Modelling Guide, p. 9 of 304 Saarbafi, Karim; Mclean, Pamela (2014). "AESO Transformer Modelling Guide"(PDF). Calgary: AESO - Alberta Electric System Operator (prepared by Teshmont Consultants LP). pp. 304 pages. Retrieved August 6, 2018.
Brenner & Javid 1959, §18-6 The Ideal Transformer, pp. 597-600: Eq. 2.2 holds exactly for an ideal transformer where, at the limit, as self-inductances approach an infinite value ( → ∞ & → ∞ ), the ratio approaches a finite value. Brenner, Egon; Javid, Mansour (1959). "Chapter 18 – Circuits with Magnetic Coupling". Analysis of Electric Circuits. McGraw-Hill. pp. esp. 586–617.
Brenner & Javid 1959, p. 602, "Fig. 18-18 In this equivalent circuit of a (nonideal) transformer the elements are physically realizable and the isolationg property of the transformer has been retained." Brenner, Egon; Javid, Mansour (1959). "Chapter 18 – Circuits with Magnetic Coupling". Analysis of Electric Circuits. McGraw-Hill. pp. esp. 586–617.