When sourcing mini books, precision is paramount due to the small scale. You must specify the binding method, such as Smyth Sewn for durability and 'lay-flat' capability, or Perfect Binding for cost-efficiency in softcovers. Pay close attention to paper weight (GSM); for mini books, 80-100 GSM offset paper or 105-128 GSM art paper is ideal to prevent the book from becoming too stiff to open. Additionally, ensure the printing resolution is at least 300 DPI to maintain text legibility at small font sizes.