APA (7th ed.) Citation

Harkishen Singh. (1999). Preface. The Sikhs, 1-5.

Chicago Style (17th ed.) Citation

Harkishen Singh. "Preface." The Sikhs 1999: 1-5.

MLA (9th ed.) Citation

Harkishen Singh. "Preface." The Sikhs, 1999, pp. 1-5.