Nordhaus, E. A.; Ringeisen, R. D.; Stewart, B. M.; White, A. T. (1972), “A Kuratowski-type theorem for the maximum genus of a graph”, Journal of Combinatorial Theory, Series B 12: 260–267, doi:10.1016/0095-8956(72)90040-8, MR0299523
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See, e.g., MR0659742, a 1983 review by Robert E. Jamison of a paper using the other definition, which attributes the ambiguity to an error in a book by Mehdi Behzad and Gary Chartrand.
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Nordhaus, E. A.; Ringeisen, R. D.; Stewart, B. M.; White, A. T. (1972), “A Kuratowski-type theorem for the maximum genus of a graph”, Journal of Combinatorial Theory, Series B 12: 260–267, doi:10.1016/0095-8956(72)90040-8, MR0299523
See, e.g., MR0659742, a 1983 review by Robert E. Jamison of a paper using the other definition, which attributes the ambiguity to an error in a book by Mehdi Behzad and Gary Chartrand.