The style of writing the authors varies. Follow the "Instructions to the Contributors' given in the periodical in which you will submit your MS.
I am giving a few examples from my publications:
Khan, M.S. and Khanam, M. 2003. Cuscutaceae. In: Rahman, M.M. and Khanam, M. (eds.), Flora of Bangladesh 55: 1-11, Bangladesh National Herbarium, Dhaka, Bangladesh.
La r s e n , K. a n d S.S. La r s e n 1980. Notes on the genus Bauhinia in Thailand. Thai ForestBull, Bot. 13: 37 - 46.
Dalzell N. A. 1872. New Leguminosae from Western India. J. Linn. Soc., Bot. 13: 185–188.
Collett, H. & Hemsley, W.B. (1890) On a collection of plants from Upper Burma and the Shan States. Journal of the Linnean Society.
Botany. London. 28: 1–150.
Wit, de H. C. D. 1956. A revision of Malaysian Bauhinieae. Reinwardtia 3: 381-539.
Larsen, K. and S. S. Larsen. 1980a. Notes on the genus Bauhinia in Thailand. Thai Forest Bull., Bot. 13: 37-46.
Larsen, K. & Larsen, S.S. 1979. Nomenclatural notes on some
Old World Bauhinia. Taxon 28: 591–592.
Bandyopadhyay S, Ghoshal PP, Pathak MK (2012) Fifty new combinations in Phanera Lour. (Leguminosae: Caesalpinioideae) from Paleotropical region. Bangladesh Journal of Plant Taxonomy 19: 55–61.
Baby AA and Raphael RK (2014). Pharmacognostic features of an endemic traditional medicine Bauhinia phoenicea Wight & Arn leaves. World Journal of Pharmacy and Pharmaceutical Sciences 3 479–485.
Elsewhere the names of the authors are also given in capital letters.