Possible Clues:

• "Zen and the __ Motorcycle Maintenance": 1974 best-seller
• Trump's "The __ the Deal"
• Bach's "The __ Fugue"
• ''The __ the Deal'' (Trump book)
• Fromm's "The __ Loving"
• Trump's "The ___ the Deal"
• Sun Tzu's 'The ___ War'