The Economist magazine lists an estimated nine million: Go home, but who will replace you?. The Economist. 16 November 2013 [2020-10-13]. (原始内容存档于2018-08-02). out of a population of 30 million: Saudi Arabia No satisfaction. The Economist. 1 February 2014 [2020-10-13]. (原始内容存档于2017-10-12).
The Economist magazine lists an estimated nine million: Go home, but who will replace you?. The Economist. 16 November 2013 [2020-10-13]. (原始内容存档于2018-08-02). out of a population of 30 million: Saudi Arabia No satisfaction. The Economist. 1 February 2014 [2020-10-13]. (原始内容存档于2017-10-12).