APA (7th ed.) Citation
Ola, P., & d'Aulaire, E. (Dec99). Taking the Measure of Time. Smithsonian, 30(9), 52-62.
Chicago Style (17th ed.) Citation
Ola, Per, and Emily d'Aulaire. "Taking the Measure of Time." Smithsonian 30, no. 9 (Dec99): 52-62.
MLA (9th ed.) Citation
Ola, Per, and Emily d'Aulaire. "Taking the Measure of Time." Smithsonian, vol. 30, no. 9, Dec99, pp. 52-62.
Warning: These citations may not always be 100% accurate.