APA (7th ed.) Citation

Gansser, U., Gansser, A., & Olschak, B. C. (1971). Bhutan: Land of the hidden treasures. Allen and Unwin.

Chicago Style (17th ed.) Citation

Gansser, Ursula, August Gansser, and Blanche Christine Olschak. Bhutan: Land of the Hidden Treasures. London: Allen and Unwin, 1971.

MLA (9th ed.) Citation

Gansser, Ursula, et al. Bhutan: Land of the Hidden Treasures. Allen and Unwin, 1971.