Παραπομπή σε μορφή APA (7η εκδ.)

Riddell, R. Inelastic response spectrum: Early history. Earthquake engineering & structural dynamics..

Παραπομπή σε μορφή Chicago (17η εκδ.)

Riddell, Rafael. "Inelastic Response Spectrum: Early History." Earthquake Engineering & Structural Dynamics. .

Παραπομπή σε μορφή MLA (9th εκδ.)

Riddell, Rafael. "Inelastic Response Spectrum: Early History." Earthquake Engineering & Structural Dynamics., .