APA (7th ed.) Citation

Gramatica, P. (2007). Principles of QSAR models validation: Internal and external. QSAR & combinatorial science, 26(5), 694-701. https://doi.org/10.1002/qsar.200610151

Chicago Style (17th ed.) Citation

Gramatica, Paola. "Principles of QSAR Models Validation: Internal and External." QSAR & Combinatorial Science 26, no. 5 (2007): 694-701. https://doi.org/10.1002/qsar.200610151.

MLA (9th ed.) Citation

Gramatica, Paola. "Principles of QSAR Models Validation: Internal and External." QSAR & Combinatorial Science, vol. 26, no. 5, 2007, pp. 694-701, https://doi.org/10.1002/qsar.200610151.