Problem with the reference details

I have two problems with the appearance of the citations. 1. The reference referral appears as: (Bertrand et al. n.d.; E. Stewart n.d.) 2. The reference containing the date and website the paper was obtained from: Liu, X. et al., Production and characterization of a group of bioemulsifiers from the marine Bacillus velezensis strain H3‏. Applied microbiology …, 2010‏. Available at: http://link.springer.com/article/10.1007/s00253-010-2653-9 [Accessed September 3, 2015]. Just to make things clear, these problems appear in all of the styles I've chose Thanks, Hilla