Cite forthcoming works in accordance with the relevant rule above (rule 6.7). Include as much information as is known. Prior to publication, page and paragraph numbers may not be known or finalised.
Put the word “forthcoming” at the end of the citation in round brackets.
Eg Dennis Denuto Compulsory Acquisition: It’s the Vibe (The Castle Press, Bonnie Doon) (forthcoming).
Eg William Collins “Advowson and Patronage” in CD Bourgh (ed) Essay on Incorporeal Hereditaments (LCDB Press, Pemberley, 2018) (forthcoming).