APA (7th ed.) Citation

Matthews, G. L. (1993). The challenge of Bahā'ú'lláh. George Ronald.

Chicago Style (17th ed.) Citation

Matthews, Gary L. The Challenge of Bahā'ú'lláh. Oxford: George Ronald, 1993.

MLA (8th ed.) Citation

Matthews, Gary L. The Challenge of Bahā'ú'lláh. George Ronald, 1993.

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