Gaya APA

Wolters, G., Heinzmann, G. (2021). Paul Lorenzen -- Mathematician and Logician (1st ed. 2021). : Springer International Publishing.

Gaya MLA

Wolters, Gereon., Heinzmann, Gerhard. "Paul Lorenzen -- Mathematician and Logician". 1st ed. 2021 : Springer International Publishing, 2021. Electronic Resource.