APA (7th ed.) Citation

Salas, A. H. An Elementary Solution to a Duffing Equation. Wiley.

Chicago Style (17th ed.) Citation

Salas, Alvaro H. An Elementary Solution to a Duffing Equation. Wiley.

MLA (9th ed.) Citation

Salas, Alvaro H. An Elementary Solution to a Duffing Equation. Wiley.

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