toggleSelect() {
    this.books.forEach(p => {
      p.checked = this.toggle;
    });
  }

  checkIfAllSelected() {
    this.toggle = this.books.every(function(item:any) {
      return item.selected == true;
    })
  }

<input type="checkbox"  [(ngModel)]="toggle" (change)="toggleSelect()">

<input type="checkbox"  [(ngModel)]="row.checked" (change)="checkIfAllSelected();">