APA (7th ed.) Citation

Rakes, C. D. (1994). 555 astable roundup. Popular Electronics, 11(1), 72.

Chicago Style (17th ed.) Citation

Rakes, Charles D. "555 Astable Roundup." Popular Electronics 11, no. 1 (1994): 72.

MLA (9th ed.) Citation

Rakes, Charles D. "555 Astable Roundup." Popular Electronics, vol. 11, no. 1, 1994, p. 72.