APA (7th ed.) Citation

Chopra, A. K. Elastic response spectrum: A historical note. Earthquake engineering & structural dynamics..

Chicago Style (17th ed.) Citation

Chopra, Anil K. "Elastic Response Spectrum: A Historical Note." Earthquake Engineering & Structural Dynamics. .

MLA (9th ed.) Citation

Chopra, Anil K. "Elastic Response Spectrum: A Historical Note." Earthquake Engineering & Structural Dynamics., .

Warning: These citations may not always be 100% accurate.