APA (7th ed.) Citation

Physics Curriculum & Instruction (Firm),$4dst, & Kanopy (Firm),$4dst. (1991). Physics of Spaceflight Series. Physics Curriculum & Instruction.

Chicago Style (17th ed.) Citation

Physics Curriculum & Instruction (Firm),$4dst, and Kanopy (Firm),$4dst. Physics of Spaceflight Series. [San Francisco, California, USA]: Physics Curriculum & Instruction, 1991.

MLA (9th ed.) Citation

Physics Curriculum & Instruction (Firm),$4dst, and Kanopy (Firm),$4dst. Physics of Spaceflight Series. Physics Curriculum & Instruction, 1991.