Flowers, Paul; Theopold, Klaus; Langley, Richard; Robinson, William R.; Frantz, Don; Hooker, Paul; Kaminski, George; Look, Jennifer; Martinez, Carol. "5.3 Enthalpy". Chemistry 2e. Open Stax. Dicapai pada 9 April 2022. We will include a superscripted “o” in the enthalpy change symbol to designate standard state.
Mills, I. M. (1989) "The choice of names and symbols for quantities in chemistry". Journal of Chemical Education (vol. 66, number 11, November 1989 p. 887–889) [Note that Mills refers to the symbol ⊖ (Unicode 2296 "Circled minus" as displayed in https://www.unicode.org/charts/PDF/U2980.pdf) as a plimsoll symbol although it lacks an extending bar in the printed article.]
Mills, I. M. (1989) "The choice of names and symbols for quantities in chemistry". Journal of Chemical Education (vol. 66, number 11, November 1989 p. 887–889) [Note that Mills refers to the symbol ⊖ (Unicode 2296 "Circled minus" as displayed in https://www.unicode.org/charts/PDF/U2980.pdf) as a plimsoll symbol although it lacks an extending bar in the printed article.]
