APA (7th ed.) Citation

W. de Vries & Romkens, P. CRITICAL LIMITS FOR HEAVY METALS.

Chicago Style (17th ed.) Citation

W. de Vries and P. Romkens. CRITICAL LIMITS FOR HEAVY METALS.

MLA (9th ed.) Citation

W. de Vries and P. Romkens. CRITICAL LIMITS FOR HEAVY METALS.

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