APA (7th ed.) Citation

Pennell, F. W. (1943). The Scrophulariaceae of the western Himalayas. [publisher not identified].

Chicago Style (17th ed.) Citation

Pennell, Francis Whittier. The Scrophulariaceae of the Western Himalayas. Philadelphia: [publisher not identified], 1943.

MLA (9th ed.) Citation

Pennell, Francis Whittier. The Scrophulariaceae of the Western Himalayas. [publisher not identified], 1943.