Format:

'Defined word' year of publication, in Title, Edition, Publisher, Place of publication, viewed Date Month Year <URL>.

Examples:

Reference list:

‘Governance’ 2012, in Merriam-Webster's Dictionary, Merriam-Webster, Springfield, Massachusetts, viewed 7 November 2016 <http://www.merriam-webster.com/dictionary/governance>.

In-text citation:

Merriam-Webster's Dictionary (2012) defines governance as ...

or:  

Governance is the way that a city, company, etc., is controlled by the people who run it (Merriam-Webster's Dictionary 2012).

Format:

Author, AA year of publication, 'Defined word' in A Editor & B Editor (eds.), Title, Edition, Publisher, Place of publication, viewed Date Month Year <URL>.

Examples:

Reference list:

Meadows, ME 2016, ‘Biodiversity’, in D Thomas, & G Andrew (eds.), The dictionary of physical geography, 4th edn, Blackwell Publishers, Oxford, viewed 9 March 2018 <https://search.credoreference.com>.

In-text citation:

Meadows (2016) defines biodiversity as ...

or:  

Biodiversity is .... (Meadows 2016).

Format:

'Article' year of publication, in Title, Edition, Publisher, Place of publication, viewed Date Month Year <URL>.

Example: 

'Impressionism' 2008, In Philip's encyclopedia online, Philips, London, viewed 15 Feb 2018 <https://search.credoreference.com>.

In-text citation:

A major movement, first in painting and later in music ('Impressionism' 2008).

or:

'Impressionism' (2008) is stated as a major movement first in painting...

Format:

Author, AA year of publication, 'Title of chapter', in Title: subtitle, Edition, Publisher, Place of publication, viewed Date Month Year <URL>.

If an author for the entry is evident, treat the same way as for a chapter in an edited book.

Example:

Weatherall, D 2005, 'Thalassemia' in DN Cooper (ed.), in Encyclopaedia of the human genome, viewed 8 February 2017 <http://www.credoreference.com/entry/wileyhg/thalassemias>.

In-text citation:

The thalassemias are the commonest genetic disorders in humans (Weatherall 2005).

or:

As stated by Weatherall (2005) 'the thalassemias are the commonest disorders..."