Gaya APA

Spivak, M. (1995/2019). e-Book - The Hitchhiker’s Guide to Calculus (Cet. 1). Amerika Serikat: American Mathematical Society (AMS).

Gaya MLA

Spivak, Michael. "e-Book - The Hitchhiker’s Guide to Calculus". Cet. 1 Amerika Serikat: American Mathematical Society (AMS), 1995/2019. Electronic Resource.