Johnson, R. (2020). Singular Perturbation Theory. Springer US.
Čikaški stil citiranjaJohnson, R.S. Singular Perturbation Theory. Springer US, 2020.
MLA način citiranjaJohnson, R.S. Singular Perturbation Theory. Springer US, 2020.
Upozorenje: Ovi citati možda nisu uvijek 100% točni.