APA

Bir S., Verma S. C., . (2010). Chromosome Atlas of the Indian Pteridophytes (1951-2009 : An Index to chromosome numbers of ferns and fern-allies of the present-day political India (with information about the related taxa from adjacent regions of Pakistan, Nepal, and Bhutan). Dehra Dun: Bishen Singh Mahendra Pal Singh.

Chicago

Bir S.S, Verma S C, . 2010. Chromosome Atlas of the Indian Pteridophytes (1951-2009 : An Index to chromosome numbers of ferns and fern-allies of the present-day political India (with information about the related taxa from adjacent regions of Pakistan, Nepal, and Bhutan). Dehra Dun: Bishen Singh Mahendra Pal Singh.

Harvard

Bir S., Verma S. C., . (2010). Chromosome Atlas of the Indian Pteridophytes (1951-2009 : An Index to chromosome numbers of ferns and fern-allies of the present-day political India (with information about the related taxa from adjacent regions of Pakistan, Nepal, and Bhutan). Dehra Dun: Bishen Singh Mahendra Pal Singh.

MLA

Bir S.S, Verma S C, . Chromosome Atlas of the Indian Pteridophytes (1951-2009 : An Index to chromosome numbers of ferns and fern-allies of the present-day political India (with information about the related taxa from adjacent regions of Pakistan, Nepal, and Bhutan). Dehra Dun: Bishen Singh Mahendra Pal Singh. 2010.