Gaya APA

Snyder, P, R., Ullrich, G, M. (2016). Practical safety management systems : a practical guide to transform your safety program into a functioning safety management systems . Washington: Aviation Supplies & Academics.

Gaya MLA

Snyder, Paul, R.., Ullrich, Gary, M.. "Practical safety management systems : a practical guide to transform your safety program into a functioning safety management systems". Washington: Aviation Supplies & Academics, 2016. Text.