Professor Lorraine Farrelly 
Basics Architecture 01: Representational Techniques [PDF ebook] 

Basics Architecture 01: Representational Techniques examines the techniques used to represent architectural design. It describes a broad array of methodologies for developing architectural ideas, ranging from two- and three-dimensional conceptual sketches, through to the working drawings required for the construction of buildings.
It offers a range of practical drawing methods, showing how to present and plan layouts, make conceptual sketches, work with scale, use collage and photomontage to create contemporary images, along with techniques to prepare and plan design portfolios.
The book also deals with contemporary computer modelling and drawing techniques. Students and practitioners will find this a useful and clear companion to a vital aspect of architectural design.