Ewald, J. J., & Clarence-Smith, W. G. (1997). The Economic Role of the Hadhrami Disapora in the Red Sea and Gulf of Aden: 1820s to 1930. In W. G. C. Smith & U. Freitag (Eds.), An Indian Ocean People: Hadhramaut and its Disapora, 1750s-1960s (pp. 281–296). Leiden: Brill.

Ewald, J. J., and William G. Clarence-Smith. “The Economic Role of the Hadhrami Disapora in the Red Sea and Gulf of Aden: 1820s to 1930.” In An Indian Ocean People: Hadhramaut and Its Disapora, 1750s-1960s, edited by William G Clarence Smith and Ulrike Freitag, 281–96. Leiden: Brill, 1997.

Ewald JJ, Clarence-Smith WG. The Economic Role of the Hadhrami Disapora in the Red Sea and Gulf of Aden: 1820s to 1930. In: Smith WGC, Freitag U, editors. An Indian Ocean People: Hadhramaut and its Disapora, 1750s-1960s. Leiden: Brill; 1997. p. 281–96.

Ewald, J. J., and William G. Clarence-Smith. “The Economic Role of the Hadhrami Disapora in the Red Sea and Gulf of Aden: 1820s to 1930.” An Indian Ocean People: Hadhramaut and Its Disapora, 1750s-1960s, edited by William G Clarence Smith and Ulrike Freitag, Leiden: Brill, 1997, pp. 281–96.

Ewald JJ, Clarence-Smith WG. The Economic Role of the Hadhrami Disapora in the Red Sea and Gulf of Aden: 1820s to 1930. In: Smith WGC, Freitag U, editors. An Indian Ocean People: Hadhramaut and its Disapora, 1750s-1960s. Leiden: Brill; 1997. p. 281–296.